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PLOT <data>,<x var>,PROBIT
plots variable <x var> in <data> on normal probability paper.
The data must be sorted in ascending order of <x var>.

The extra specifications of this form of PLOT are the same as those
of PLOT for scatter diagrams. The default YSCALE is in this case
YSCALE=*probit(y),0.001,0.01,0.1,0.5,0.9,0.99,0.999

  S = more information on scatter diagrams 
  P = more information on plotting in general