Changed gap back to 1um

src/main.cpp

@@ -137,7 +137,7 @@ int main(){
   }
 */
   /*Mesh deformers*/
-  double extra_gap = 0.0015;
+  double extra_gap = 0.;
   /*Si3N4*/
   constant_deformer top_def_si_air(-1.6192);
   constant_deformer top_def_si_sio2(-1.9992);