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Text File  |  1992-09-18  |  177 b   |  8 lines
  1. 5 dict begin
  2. /angle exch def /freq exch def
  3. currentscreen
  4. /oldproc exch def
  5. /oldangle exch def
  6. /oldfreq exch def
  7. freq angle {180 mul sin exch 180 mul sin add 0.5 mul} setscreen
  8.