UPDATE 2012 MAY JMW: SYMBOL is now included as part of IDL. By the way here is the calling sequence:
PLOT,X,Y,PSYM=SYM(NUMBER)
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IDL has a poor selection of plot symbols, so I downloaded routines from the web that do a better job. Look at symbol.pro in /usr/share/astro/idlshare/local.
I should somehow put this in a library but for now I copied and pasted the routines (except the first, driver routine) into the top of a user file and then called it to get nice fat filled circles.
See /data/psrdata/swigglitch/GlitchRead.4.1.pro
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