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            "valid_max":"20.0",
            "valid_min":"-1.0",
            "value":"",
            "z_bounds_factors":"p0: p0 lev: lev_bnds",
            "z_factors":"p0: p0 lev: lev"
        },
        "ocean_double_sigma":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"for k <= k_c:\n z(k,j,i)= sigma(k)*f(j,i) \n for k > k_c:\n z(k,j,i)= f(j,i) + (sigma(k)-1)*(depth(j,i)-f(j,i)) \n f(j,i)= 0.5*(z1+ z2) + 0.5*(z1-z2)* tanh(2*a/(z1-z2)*(depth(j,i)-href))",
            "generic_level_name":"olevel",
            "long_name":"ocean double sigma coordinate",
            "must_have_bounds":"yes",
            "out_name":"lev",
            "positive":"up",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"ocean_double_sigma",
            "stored_direction":"",
            "tolerance":"",
            "type":"",
            "units":"",
            "valid_max":"",
            "valid_min":"",
            "value":"",
            "z_bounds_factors":"sigma: sigma_bnds depth: depth z1: z1 z2: z2 a: a href: href k_c: k_c",
            "z_factors":"sigma: sigma depth: depth z1: z1 z2: z2 a: a_coeff href: href k_c: k_c"
        },
        "ocean_s":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"z(n,k,j,i) = eta(n,j,i)*(1+s(k)) + depth_c*s(k) + (depth(j,i)-depth_c)*C(k) \n where \n C(k)=(1-b)*sinh(a*s(k))/sinh(a) +\n           b*(tanh(a*(s(k)+0.5))/(2*tanh(0.5*a)) - 0.5)",
            "generic_level_name":"olevel",
            "long_name":"ocean s-coordinate",
            "must_have_bounds":"yes",
            "out_name":"lev",
            "positive":"up",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"ocean_s_coordinate",
            "stored_direction":"decreasing",
            "tolerance":"",
            "type":"",
            "units":"",
            "valid_max":"0.0",
            "valid_min":"-1.0",
            "value":"",
            "z_bounds_factors":"s: lev_bnds eta: eta depth: depth a: a b: b depth_c: depth_c",
            "z_factors":"s: lev eta: eta depth: depth a: a_coeff b: b_coeff depth_c: depth_c"
        },
        "ocean_sigma":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"z(n,k,j,i) = eta(n,j,i) + sigma(k)*(depth(j,i)+eta(n,j,i))",
            "generic_level_name":"olevel",
            "long_name":"ocean sigma coordinate",
            "must_have_bounds":"yes",
            "out_name":"lev",
            "positive":"up",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"ocean_sigma_coordinate",
            "stored_direction":"decreasing",
            "tolerance":"",
            "type":"",
            "units":"",
            "valid_max":"0.0",
            "valid_min":"-1.0",
            "value":"",
            "z_bounds_factors":"sigma: lev_bnds eta: eta depth: depth",
            "z_factors":"sigma: lev eta: eta depth: depth"
        },
        "ocean_sigma_z":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"for k <= nsigma: z(n,k,j,i) = eta(n,j,i) + sigma(k)*(min(depth_c,depth(j,i))+eta(n,j,i)) ; for k > nsigma: z(n,k,j,i) = zlev(k)",
            "generic_level_name":"olevel",
            "long_name":"ocean sigma over z coordinate",
            "must_have_bounds":"yes",
            "out_name":"lev",
            "positive":"",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"ocean_sigma_z",
            "stored_direction":"",
            "tolerance":"",
            "type":"",
            "units":"",
            "valid_max":"",
            "valid_min":"",
            "value":"",
            "z_bounds_factors":"sigma: sigma_bnds eta: eta depth: depth depth_c: depth_c nsigma: nsigma zlev: zlev_bnds",
            "z_factors":"sigma: sigma eta: eta depth: depth depth_c: depth_c nsigma: nsigma zlev: zlev"
        },
        "olayer100m":{
            "axis":"Z",
            "bounds_values":"0.0 100.0",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"depth",
            "must_have_bounds":"no",
            "out_name":"depth",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"depth",
            "stored_direction":"increasing",
            "tolerance":"",
            "type":"double",
            "units":"m",
            "valid_max":"100.0",
            "valid_min":"0.0",
            "value":"50.",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "olevhalf":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"ocean model half levels",
            "must_have_bounds":"no",
            "out_name":"lev",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"",
            "stored_direction":"",
            "tolerance":"",
            "type":"double",
            "units":"",
            "valid_max":"",
            "valid_min":"",
            "value":"",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "oline":{
            "axis":"",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"ocean passage",
            "must_have_bounds":"no",
            "out_name":"line",
            "positive":"",
            "requested":[
                "barents_opening",
                "bering_strait",
                "windward_passage",
                "davis_strait",
                "denmark_strait",
                "drake_passage",
                "english_channel",
                "faroe_scotland_channel",
                "florida_bahamas_strait",
                "fram_strait",
                "gibraltar_strait",
                "iceland_faroe_channel",
                "indonesian_throughflow",
                "mozambique_channel",
                "pacific_equatorial_undercurrent",
                "taiwan_luzon_straits"
            ],
            "requested_bounds":"",
            "standard_name":"region",
            "stored_direction":"",
            "tolerance":"",
            "type":"character",
            "units":"",
            "valid_max":"",
            "valid_min":"",
            "value":"",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "p10":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"no",
            "out_name":"plev",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"",
            "tolerance":"",
            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
            "value":"1000.",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "p100":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"no",
            "out_name":"plev",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"",
            "tolerance":"",
            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
            "value":"10000.",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "p1000":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"no",
            "out_name":"plev",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"",
            "tolerance":"",
            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
            "value":"100000.",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "p200":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"no",
            "out_name":"plev",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"",
            "tolerance":"",
            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
            "value":"20000.",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "p220":{
            "axis":"Z",
            "bounds_values":"44000.0 0.0",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"yes",
            "out_name":"plev",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"decreasing",
            "tolerance":"",
            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
            "value":"22000.",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "p500":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"no",
            "out_name":"plev",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"",
            "tolerance":"",
            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
            "value":"50000.",
            "z_bounds_factors":"",
            "z_factors":""
        },
        "p560":{
            "axis":"Z",
            "bounds_values":"68000.0 44000.0",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"yes",
            "out_name":"plev",
            "positive":"down",
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            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"decreasing",
            "tolerance":"",
            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
            "value":"56000.",
            "z_bounds_factors":"",
            "z_factors":""
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        "p700":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"no",
            "out_name":"plev",
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            "requested_bounds":"",
            "standard_name":"air_pressure",
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            "valid_min":"",
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            "z_bounds_factors":"",
            "z_factors":""
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        "p840":{
            "axis":"Z",
            "bounds_values":"100000.0 68000.0",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"pressure",
            "must_have_bounds":"yes",
            "out_name":"plev",
            "positive":"down",
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            "requested_bounds":"",
            "standard_name":"air_pressure",
            "stored_direction":"decreasing",
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            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
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            "z_bounds_factors":"",
            "z_factors":""
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        "p850":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
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            "requested_bounds":"",
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            "type":"double",
            "units":"Pa",
            "valid_max":"",
            "valid_min":"",
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            "z_bounds_factors":"",
            "z_factors":""
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            "axis":"Z",
            "bounds_values":"85000.0 60000.0",
            "climatology":"",
            "formula":"",
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            "requested_bounds":"",
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            "z_factors":""
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            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
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                "40000.",
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            "requested_bounds":"",
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            "z_factors":""
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            "bounds_values":"",
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            "requested_bounds":"",
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            "requested_bounds":"",
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            "z_factors":""
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            "requested_bounds":"",
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            "z_factors":""
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                "3."
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            "requested_bounds":"",
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            "z_factors":""
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            "axis":"Z",
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            "requested_bounds":"",
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        "plev4":{
            "axis":"Z",
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            "climatology":"",
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            "generic_level_name":"",
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            "requested_bounds":"",
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            "z_bounds_factors":"",
            "z_factors":""
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        "plev7":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
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            "requested_bounds":[
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            "standard_name":"air_pressure",
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            "z_factors":""
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            "requested_bounds":[
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            "z_factors":""
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        "rho":{
            "axis":"Z",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"potential density referenced to 2000 dbar",
            "must_have_bounds":"yes",
            "out_name":"rho",
            "positive":"down",
            "requested":"",
            "requested_bounds":"",
            "standard_name":"sea_water_potential_density",
            "stored_direction":"increasing",
            "tolerance":"",
            "type":"double",
            "units":"kg m-3",
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            "z_factors":""
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        "scatratio":{
            "axis":"",
            "bounds_values":"",
            "climatology":"",
            "formula":"",
            "generic_level_name":"",
            "long_name":"lidar backscattering ratio",
            "must_have_bounds":"yes",
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