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(gnuplot.info)samples

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 The sampling rate of functions, or for interpolating data, may be changed
 by the `set samples` command.

 Syntax:
       set samples <samples_1> {,<samples_2>}
       show samples

 By default, sampling is set to 100 points.  A higher sampling rate will
 produce more accurate plots, but will take longer.  This parameter has no
 effect on data file plotting unless one of the interpolation/approximation
 options is used.  See `plot smooth` (Note: smooth ) re 2-d data and  `set
 cntrparam` (Note: cntrparam ) and `set dgrid3d` (Note: dgrid3d ) re 3-d
 data.

 When a 2-d graph is being done, only the value of <samples_1> is relevant.

 When a surface plot is being done without the removal of hidden lines, the
 value of samples specifies the number of samples that are to be evaluated for
 the isolines.  Each iso-v line will have <sample_1> samples and each iso-u
 line will have <sample_2> samples.  If you only specify <samples_1>,
 <samples_2> will be set to the same value as <samples_1>.  See also `set
 isosamples`.