Added logic to handle cases when and RO value contains an X/Y Plot but with text before the plot language

fixed bad indexes - inserting the superscript On/Off commands

PROMS/XYPlots/XYPlots.cs

@@ -915,7 +915,7 @@ namespace XYPlots
 		private int addpower(int i)
 		{
 			int tlen;
-			powerstring = string.Format("x10{0}{1}{2}", SuperScript[1], i.ToString(), SuperScript[2]);
+			powerstring = string.Format("x10{0}{1}{2}", SuperScript[0], i.ToString(), SuperScript[1]);
 			valuestring = valuestring + powerstring;
 			tlen = SuperScript[0].Length + SuperScript[1].Length;
 			return (powerstring.Length - tlen);