Specify the column in the
data file from which the symbol codes are to be read.
This command is a synonym for SETGLOBAL PONGO_SYMCOL.
Usage:
pcolumn symcol
Parameters:
SYMCOL = _CHAR (Read and Write)
The column number (counting from 1),
or the symbolic name of a column, from which the PGPLOT symbol code for each data
point is read by the READF command. The value "0" means "do not read these data". []