Add debug option to reduce number of maps

map.cpp

@@ -185,6 +185,11 @@ int bioem_RefMap::readRefMaps(bioem_param& param)
 			fclose(fp);
 		}
 	}
+	
+	if (getenv("BIOEM_DEBUG_NMAPS"))
+	{
+	    ntotRefMap = atoi(getenv("BIOEM_DEBUG_NMAPS"));
+	}
 
 	cout << "Total Number of particles: " << ntotRefMap;
 	cout << "\n+++++++++++++++++++++++++++++++++++++++++++ \n";