ftp.nice.ch/pub/next/unix/developer/plplot.3.0.s.tar.gz#/plplot/src/plgra.c

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/* Switches to graphics mode */

#include "plplot.h"

void plgra()
{
      int level;
      glev(&level);
      if (level < 1) plexit("Please call plstar before plgra.");
      grgra();
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.