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eintr: print-X-axis

 
 C.3 The ‘print-X-axis’ Function
 ===============================
 
 X axis labels are much like Y axis labels, except that the ticks 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 ticks 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 labeled.

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· Similarities differences    Much like ‘print-Y-axis’, but not exactly.
· X Axis Tic Marks            Create tic marks for the horizontal axis.
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