diff --git a/PROMS/XYPlots/XYPlots.cs b/PROMS/XYPlots/XYPlots.cs
index 7721e5af..8ac65c0d 100644
--- a/PROMS/XYPlots/XYPlots.cs
+++ b/PROMS/XYPlots/XYPlots.cs
@@ -522,7 +522,7 @@ namespace XYPlots
 				Buff = Buff.Substring(0, Buff.Length - 2) + "  \r\n\0x00"; // needs to end with null
 			else if (Buff.EndsWith(">")) // doesn't end with return chars...
 				Buff = Buff.Substring(0, Buff.Length - 1) + " \r\n\0x00"; // needs to end with null
-			Buff = Regex.Replace(Buff, @"\\u([0-9]{1,4})\?", m => int.TryParse(m?.Groups[1]?.Value, out int result) ? Convert.ToChar(result).ToString() : "");
+			Buff = Regex.Replace(Buff, @"\\u([0-9]{1,4})\?", m => int.TryParse(m?.Groups[1]?.Value, out int result) ? Convert.ToChar(result).ToString() : ""); // C2022-003 RO Symbols. Convert unicode to character.
 			Buff = Regex.Replace(Buff, @"([0-9])\r\n([0-9])", "$1 $2");
 		}
 		private void CloseGraph()