Sets diagram labels
| showLabels | Boolean | |
| sigFig | optional integer | Number of significant figures to be used to display diagram values | 
| fontDesc | optional VARIANT | font i.e. "Arial;120;Normal;NoItalic;NoUnderline;NoStrikeOut;0;" | 
| peaksOnly | optional VARIANT | if true, only peaks will be labelled. If false, each end of every element will be labelled | 
| Return value | none | 
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