git-svn-id: file:///home/svn/opt_utilities@241 ed2142bd-67ad-457f-ba7c-d818d4011675

1 files changed, 3 insertions, 3 deletions

diff --git a/models/beta1d.hpp b/models/beta1d.hpp
index bd5d292..9885098 100644
--- a/models/beta1d.hpp
+++ b/models/beta1d.hpp
@@ -40,10 +40,10 @@ namespace opt_utilities
 
     T do_eval(const T& x,const std::vector<T>& param)
     {
-      T S0=get_element(param,0);
+      T S0=std::abs(get_element(param,0));
       T r_c=get_element(param,1);
-      T beta=get_element(param,2);
-      T bkg=get_element(param,3);
+      T beta=std::abs(get_element(param,2));
+      T bkg=std::abs(get_element(param,3));
 
       return bkg+S0*pow(1+(x*x)/(r_c*r_c),-3*beta+static_cast<T>(.5));
     }