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+    struct udft_entry *next_udf; /* pointer to next udf in linked list */
+    char *udf_name;		/* name of this function entry */
+    struct at_type *at;		/* pointer to action table to execute */
+    char *definition;		/* definition of function as typed */
+    t_value dummy_values[MAX_NUM_VAR]; /* current value of dummy variables */
+} udft_entry;
+
+typedef struct {
+  /** Constants: **/
+
+  /* (Fixed) number of formulae implemented for gray index to RGB
+   * mapping in color.c.  Usage: somewhere in `set' command to check
+   * that each of the below-given formula R,G,B are lower than this
+   * value. */
+  int colorFormulae;
+
+  /** Values that can be changed by `set' and shown by `show' commands: **/
+
+  /* can be SMPAL_COLOR_MODE_GRAY or SMPAL_COLOR_MODE_RGB */
+  palette_color_mode colorMode;
+  /* mapping formulae for SMPAL_COLOR_MODE_RGB */
+  int formulaR, formulaG, formulaB;
+  char positive;		/* positive or negative figure */
+
+  /* Now the variables that contain the discrete approximation of the
+   * desired palette of smooth colours as created by make_palette in
+   * pm3d.c.  This is then passed into terminal's make_palette, who
+   * transforms this [0;1] into whatever it supports.  */
+
+  /* Only this number of colour positions will be used even though
+   * there are some more available in the discrete palette of the
+   * terminal.  Useful for multiplot.  Max. number of colours is taken
+   * if this value equals 0.  Unused by: PostScript */
+  int use_maxcolors;
+  /* Number of colours used for the discrete palette. Equals to the
+   * result from term->make_palette(NULL), or restricted by
+   * use_maxcolor.  Used by: pm, gif. Unused by: PostScript */
+  int colors;
+  /* Table of RGB triplets resulted from applying the formulae. Used
+   * in the 2nd call to term->make_palette for a terminal with
+   * discrete colours. Unused by PostScript which has calculates them
+   * analytically. */
+  rgb_color *color;
+
+  /** Variables used by some terminals **/
+  
+  /* Option unique for output to PostScript file.  By default,
+   * ps_allcF=0 and only the 3 selected rgb color formulae are written
+   * into the header preceding pm3d map in the file.  If ps_allcF is
+   * non-zero, then print there all color formulae, so that it is easy
+   * to play with choosing manually any color scheme in the PS file
+   * (see the definition of "/g"). Like that you can get the
+   * Rosenbrock multiplot figure on my gnuplot.html#pm3d demo page.
+   * Note: this option is used by all terminals of the postscript
+   * family, i.e. postscript, pslatex, epslatex, so it will not be
+   * comfortable to move it to the particular .trm files. */
+  char ps_allcF;
+
+  /* These variables are used to define interpolated color palettes:
+   * gradient is an array if (gray,color) pairs.  This array is