plcont: Contour plot, fixed linear mapping for Fortran 77

The PLplot Plotting Library: Programmer's Reference Manual
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### `plcont`: Contour plot, fixed linear mapping for Fortran 77

`plcont` (z, nx, ny, kx, lx, ky, ly, clevel, nlevel);

When called from Fortran 77, this routine has the same effect as when invoked from C. The interpretation of all parameters (see `plcont`) 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 `plcon0`, `plcon1`, or `plcon2` instead.

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`plcon2`: Contour plot, general 2-d mapping for Fortran 77 | Up | `plvec0`: Vector plot, identity mapping for Fortran 77