Mark downward-connected region on segment map starting at node pt.
Modifies mdata mask and map.
mdata : masked ndarray
Masked data array.
map : :
Array mapping out segments.
pt : tuple of ints
Index of starting node
mark : int
Integer to mark map with.
nmrglue.analysis.segmentation.find_upward
nmrglue.analysis.segmentation.label_downward_seg
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