From 32b521b1de91a2c7f7ea9774ccb0435f4936a1c2 Mon Sep 17 00:00:00 2001
From: cortespea <cortespea@ad.engr.wisc.edu>
Date: Fri, 15 Dec 2023 13:09:49 -0600
Subject: [PATCH] fix bug with copy flow with different phase letter case

---
 thermosteam/_phase.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/thermosteam/_phase.py b/thermosteam/_phase.py
index 9873d76a..eed9de35 100644
--- a/thermosteam/_phase.py
+++ b/thermosteam/_phase.py
@@ -110,7 +110,14 @@ def __call__(self, phase):
         try:
             return self._index[phase]
         except:
-            raise UndefinedPhase(phase)        
+            if phase.isupper():
+                phase = phase.lower()
+            else:
+                phase = phase.upper()
+            try:
+                return self._index[phase]
+            except:
+                raise UndefinedPhase(phase)        
     
     @property
     def phases(self):