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Subkey               Default Options                 
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mask                 None    None, subtract, multiply
segtype              None    None, Ring, Dilate      
segradius            5       Integer > 0             
N_blobs              1       Integer > 0             
fillholes            True    True, False             
remove_small_objects False   True, False             
min_object_size      2       Integer > 0             
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