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[GREG1\]ERRORBAR Argument [Array_X Array_Y Array_Z [Orientation]]
This command draws error bars on all (X,Y) points (read by COLUMN X and
Y, or specified in Array_X Array_Y) of length read by COLUMN Z or speci-
fied by Array_Z. Argument may be +X X -X +Y Y or -Y. Symmetric error-
bars are drawn if you do not specify the sign, while only the errorbar
of the given sign is drawn if you do so. This allows independent error-
bars in opposite directions. The size of the line at the end of the er-
rorbar is the Marker size and can therefore be adjusted with SET MARKER.
Errorbars with arbitrary orientation can be obtained by specifying code
+O, O or -O. The orientation (in degrees) is then either read from a
fourth array if one is specified on the command line, or otherwise taken
from the current marker orientation (as specified in SET ORIENTATION).