From 99f3962207af3bb193e7bdee6f98aa6890fcfb9b Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Fri, 17 Jun 2011 15:50:36 -0400
Subject: [PATCH] Use abs(C) in fit_psd() (to match breit_wigner()).

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

diff --git a/calibcant/vib_analyze.py b/calibcant/vib_analyze.py
index d226d35..59c8317 100644
--- a/calibcant/vib_analyze.py
+++ b/calibcant/vib_analyze.py
@@ -436,7 +436,8 @@ def fit_psd(freq_axis, psd_data, min_frequency=500, max_frequency=25000,
         A,B,C = p
         D = 0
     A=abs(A) # A and B only show up as squares in f(x)
-    B=abs(B) # so ensure we get positive values
+    B=abs(B) # so ensure we get positive values.
+    C=abs(C) # Only abs(C) is used in breit_wigner().
     return (A, B, C, D)
 
 def breit_wigner_area(A, B, C):
-- 
2.26.2