plssym: Set symbol size 

DESCRIPTION:

    This sets up the size of all subsequent symbols drawn by plpoin and
    plsym.  The actual height of a symbol is the product of the default
    symbol size and a scaling factor as for the character height. 

SYNOPSIS:

plssym(def, scale)

ARGUMENTS:

    def (PLFLT, input) :    The default height of a symbol in millimeters,
    should be set to zero if the default height is to remain
    unchanged. 

    scale (PLFLT, input) :    Scale factor to be applied to default to get
    actual symbol height.