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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _pg_vlabelchart function writes text vertically on the screen.
     The <x> and <y> arguments are pixel coordinates for the beginning
     location of text relative to the upper-left corner of the chart
     window.
 
     Return Value
 
     The _pg_vlabelchart function returns 0 if there were no errors. A
     nonzero value indicates a failure.
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