Surface - A utility for drawing perspective picture of a function of two variables with hidden lines

       To use Surface routines, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in
       that order.

       c_ezsrfc
       c_pwrzs
       c_setr
       c_srface

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.

UNIX                                               March 1993                                    Surface(3NCARG)

       Surface - A utility for drawing perspective picture of a function of two variables with hidden lines
       removed.

       Online: surface_params, ezsrfc, pwrzs, setr, srface.  ncarg_cbind.

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version

       EZSRFC - Draws a perspective picture of a function of two variables with hidden lines removed. The
       function is approximated by a two-dimensional array of heights. Use EZSRFC only if the entire array is to
       be drawn, the data points are equally spaced in the X-Y plane, there are no stereo pairs, and scaling is
       chosen internally.

       PWRZS - A character-plotting routine for plotting characters in three-space when using SRFACE.

       SETR - Establishes certain constants so that SRFACE produces a picture whose size changes with respect to
       the viewer's distance from the object.  It can also be used when making a movie of an object evolving in
       time to keep it positioned properly on the screen, saving computer time in the bargin.  Call it with r0
       negative to turn off this feature.

       SRFACE - Draws a perspective picture of a function of two variables with hidden lines removed. The
       function is approximated by a two-dimensional array of heights.