psmeca color doesn't plot colors from negative values

[celsoa]

psmeca doesn't plot beachballs if values in the 3rd column are negative. This comes up when using cpt to color the beachballs.
for example, this works
0 0 1 8.9819500e-01 -1.0543200e-01 -5.2059600e-01 -4.7086300e-01 -1.8221400e-01 -4.4793000e-01 20
but this doesn't work
0 0 -1 8.9819500e-01 -1.0543200e-01 -5.2059600e-01 -4.7086300e-01 -1.8221400e-01 -4.4793000e-01 20

[carltape]

Perhaps that is hard-wired, since they always expect depth (third columns) to be positive. Silly restriction!