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XPLM_API void                 XPLMSetDatavf(
                                   XPLMDataRef          inDataRef,    
                                   float *              inValues,    
                                   int                  inoffset,    
                                   int                  inCount);    

Write part or all of a single precision floating point array dataref. The values passed by inValues are written into the dataref starting at inOffset. Up to inCount values are written; however if the values would write "off the end" of the dataref array, then fewer values are written.

Note: the semantics of array datarefs are entirely implemented by the plugin (or X-Plane) that provides the dataref, not the SDK itself; the above description is how these datarefs are intended to work, but a rogue plugin may have different behavior.