infile, f, a, "", , ,		">input data file name"
outtable, f, a, "", , ,		">output table name"

inmask, f, a, "", , ,		">input data mask name"
udlfile, f, a, "", , ,		">input UDL file name"
np_ceiling, i, a, 1, 1, ,	">no. of points used to determine ceiling level"
np_floor, i, a, 0, 0, ,		">no. of points used to determine floor level"
xmin, i, a, 0, 0, ,		">left x-pixel of the selected section"
xmax, i, a, 0, 0, ,		">right x-pixel of the selected section"
ymin, i, a, 0, 0, ,		">lower y-pixel of the selected section"
ymax, i, a, 0, 0, ,		">upper y-pixel of the selected section"
edge_level, r, a, 0.5, 0., 1.,	">fraction of the floor-to-ceiling level \n\
  used to determine the edge level"
contourkeep, b, a, yes, , ,	">keep coordinates of circle edge in a table?"
contourtable, f, a, "", , ,	">contour table name"

xweight, r, a, -2, , ,		">weighting scheme of x axis"
yweight, r, a, -2, , ,		">weighting scheme of y axis"
itermax, i, a, 100, 1, ,	">maximum number of iterations"
tolern, r, a, 1.e-12, 0, 1,	">tolerance of sigma-squared's convergence"

mode, s, h, h