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plvect: Vector plot, fixed linear mapping for
fortran
      When called from Fortran, this routine has the same effect as when
      invoked from C.  The interpretation of all parameters (see plvect)
      is also the same except there is no transformation function supplied
      as the last parameter.  Instead, a 6-element array specifying
      coefficients to use in the transformation is supplied via the named
      common block plplot (see code). Since this
      approach is somewhat inflexible, the user is recommended to call
      either of plvec0, plvec1, or plvec2 instead.