Trange

Syntax: set trange [tmin:tmax] The range of the parametric variable t is useful in three contexts. 1) In parametric mode plot commands it limits the range of sampling

  for both generating functions.  See `set parametric`, `set samples`.

2) In polar mode plot commands it limits or defines the range of the

  angular parameter theta. See `polar`.

3) In plot or splot commands using 1-dimensional sampled data via

  the pseudofile "+".  See `sampling 1D`, `special-filenames`.