plprec: Set precision in numeric labels

`plprec`: Set precision in numeric labels
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`plprec (`	`setp` ,
	`prec` `)`;

Sets the number of places after the decimal point in numeric labels.

setp (PLINT, input): If setp is equal to 0 then PLplot automatically determines the number of places to use after the decimal point in numeric labels (like those used to label axes). If setp is 1 then prec sets the number of places.
prec (PLINT, input): The number of characters to draw after the decimal point in numeric labels.

Redacted form: plprec(setp, prec)

This function is used in example 29.

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