plgzax: Get z axis parameters

`plgzax`: Get z axis parameters
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`plgzax (`	`p_digmax`,
	`p_digits)`;

Identical to plgxax, except that arguments are flags for z axis. See the description of plgxax for more detail.

p_digmax (PLINT_NC_SCALAR, output): Returned value of the maximum number of digits for the z axis. If nonzero, the printed label has been switched to a floating-point representation when the number of digits exceeds this value.
p_digits (PLINT_NC_SCALAR, output): Returned value of the actual number of digits for the numeric labels (z axis) from the last plot.

Redacted form: plgzax(p_digmax, p_digits)

This function is used in example 31.

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`plgyax`: Get y axis parameters	Home	`plhist`: Plot a histogram from unbinned data