setenv CTM_LTNG_NO Y         #> turn on lightning NOx [ default: N ]  
..
...
#> Lightning NOx configuration
  if ( $CTM_LTNG_NO == 'Y' ) then
     setenv LTNGNO "InLine"    #> set LTNGNO to "Inline" to activate in-line calculation

  #> In-line lightning NOx options
     setenv USE_NLDN  N        #> use hourly NLDN strike file [ default: Y ]
     if ( $USE_NLDN == Y ) then
        setenv NLDN_STRIKES ${IN_LTpath}/NLDN.12US1.${YYYYMMDD}_bench.nc
     endif
     setenv LTNGPARMS_FILE ${IN_LTpath}/LTNG_AllParms_${domid}.nc    #LTNG_AllParms_12US1_bench.nc #> lightning parameter file
  endif

 Note: $domid here indicates d01, d02, and d03