Get Offset of Trace in Graph

Function GetTraceOffset(graphName, traceName, instance, which)
	String graphName	// "" for top graph
	String traceName
	Variable instance 	// Usually 0
	Variable which		// 0 for X, 1 for Y
	
	String info= TraceInfo(graphName,traceName, instance)
	
	String offsets = StringByKey("offset(x)",info,"=",";") // "{xOffset,yOffset}"
	
	Variable xOffset,yOffset
	sscanf offsets, "{%g,%g}",xOffset,yOffset
	
	if (which)
		return yOffset
	endif
	return xOffset
End