smudgeplot.py plot kmcdb_L"$L"_U"$U"_pairs.tsv
usage: smudgeplot plot [-h] [-o O] [-c C] [-t TITLE] [-ylim YLIM] [-col_ramp COL_RAMP] [--invert_cols]
infile smudgefile n
smudgeplot plot: error: the following arguments are required: smudgefile, n