diff --git a/benchmarks/rich/src/CherenkovPIDAnalysis.cc b/benchmarks/rich/src/CherenkovPIDAnalysis.cc
index b57d2524a7cbd3b5fc30fe3b60e96a87fc2bdbcc..18817b6953b63fafe0fd3875fefcb968abe55acb 100644
--- a/benchmarks/rich/src/CherenkovPIDAnalysis.cc
+++ b/benchmarks/rich/src/CherenkovPIDAnalysis.cc
@@ -78,7 +78,7 @@ namespace benchmarks {
     m_mcRindex_dist = new TH1D(
         "mcRindex_"+m_rad_name_trun,
         "MC Refractive Index for "+m_rad_title+";n",
-        10*Tools::n_bins, 0.99, 1.03
+        10*Tools::n_bins, 0.99, 1.04
         );
 
     // PID
@@ -232,7 +232,7 @@ namespace benchmarks {
       // calculate expected Cherenkov angle `theta_exp` and residual `theta_resid`,
       // using refractive index from MC truth
       float mc_rindex=0; 
-      if(m_rad_name=="Aerogel") mc_rindex =1.019; 
+      if(m_rad_name=="Aerogel") mc_rindex =1.0295; 
       else if(m_rad_name=="Gas") mc_rindex = 1.00076; 
       else mc_rindex = cherenkov_pid.getRefractiveIndex(); // average 
       auto theta_exp = TMath::ACos(