From aa2784d5852ffda785de504cbc2d9b88225173dd Mon Sep 17 00:00:00 2001
From: "Karl D. Gordon" <kgordon@stsci.edu>
Date: Tue, 14 Nov 2023 14:59:20 -0500
Subject: [PATCH] including B3 for FM90_B3 fit

---
 measure_extinction/extdata.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/measure_extinction/extdata.py b/measure_extinction/extdata.py
index 0ce8ae3..7d62e2a 100644
--- a/measure_extinction/extdata.py
+++ b/measure_extinction/extdata.py
@@ -1187,7 +1187,8 @@ def read(self, ext_filename):
                     self.columns_p50_fit[bkey] = (val, punc, munc)
 
         # get FM90 parameters if they exist
-        FM90_keys = ["C1", "C2", "C3", "C4", "XO", "GAMMA"]
+        #   include variant with B3=C3/gamma^2 instead of C3
+        FM90_keys = ["C1", "C2", "C3", "B3", "C4", "XO", "GAMMA"]
         if pheader.get("C2"):
             self.fm90_best_fit = {}
             for curkey in FM90_keys: