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(emacs-lisp-intro.info)print-X-axis

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The `print-X-axis' Function
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   X axis labels are much like Y axis labels, except that the tics are
on a line above the numbers.  Labels should look like this:

         |   |    |    |
         1   5   10   15

   The first tic is under the first column of the graph and is preceded
by several blank spaces.  These spaces provide room in rows above for
the Y axis labels.  The second, third, fourth, and subsequent tics are
all spaced equally, according to the value of `X-axis-label-spacing'.

   The second row of the X axis consists of numbers, preceded by several
blank spaces and also separated according to the value of the variable
`X-axis-label-spacing'.

   The value of the variable `X-axis-label-spacing' should itself be
measured in units of `symbol-width', since you may want to change the
width of the symbols that you are using to print the body of the graph
without changing the ways the graph is labelled.

Similarities differences

Much like `print-Y-axis', but not exactly.

X Axis Tic Marks

Create tic marks for the horizontal axis.