pro get_forcing_histos, fname, log_iwp_bins, forcing_bins


common total_forcing_arrays, log_iwp_toa_net_forcing_M_histo_total, log_iwp_toa_solar_forcing_M_histo_total, $
log_iwp_toa_IR_forcing_M_histo_total, log_iwp_atm_net_forcing_histo_total, log_iwp_atm_solar_forcing_histo_total, $
log_iwp_atm_IR_forcing_histo_total, log_iwp_sfc_net_forcing_obs_histo_total, log_iwp_sfc_solar_forcing_obs_histo_total, $
log_iwp_sfc_IR_forcing_obs_histo_total, log_iwp_sfc_net_forcing_histo_total, log_iwp_sfc_IR_forcing_histo_total, $
log_iwp_sfc_solar_forcing_histo_total, log_iwp_toa_net_forcing_histo_total, log_iwp_toa_solar_forcing_histo_total, $
log_iwp_toa_IR_forcing_histo_total

; check to see if the file exists

OPENR, 1, fname, ERROR = err

if err eq 0 then begin
close, 1

; file exists, read the data
cdfid=ncdf_open(fname,/nowrite)
print, 'reading ',fname

log_iwp_toa_net_forcing_M_histo_total_id=ncdf_varid(cdfid, 'log_iwp_toa_net_forcing_M_histo_total')
log_iwp_toa_solar_forcing_M_histo_total_id=ncdf_varid(cdfid, 'log_iwp_toa_solar_forcing_M_histo_total')
log_iwp_toa_IR_forcing_M_histo_total_id=ncdf_varid(cdfid, 'log_iwp_toa_IR_forcing_M_histo_total')
log_iwp_atm_net_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_atm_net_forcing_histo_total')
log_iwp_atm_solar_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_atm_solar_forcing_histo_total')
log_iwp_atm_IR_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_atm_IR_forcing_histo_total')
log_iwp_sfc_net_forcing_obs_histo_total_id=ncdf_varid(cdfid, 'log_iwp_sfc_net_forcing_obs_histo_total')
log_iwp_sfc_solar_forcing_obs_histo_total_id=ncdf_varid(cdfid, 'log_iwp_sfc_solar_forcing_obs_histo_total')
log_iwp_sfc_IR_forcing_obs_histo_total_id=ncdf_varid(cdfid, 'log_iwp_sfc_IR_forcing_obs_histo_total')
log_iwp_sfc_net_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_sfc_net_forcing_histo_total')
log_iwp_sfc_IR_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_sfc_IR_forcing_histo_total')
log_iwp_sfc_solar_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_sfc_solar_forcing_histo_total')
log_iwp_toa_net_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_toa_net_forcing_histo_total')
log_iwp_toa_solar_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_toa_solar_forcing_histo_total')
log_iwp_toa_IR_forcing_histo_total_id=ncdf_varid(cdfid, 'log_iwp_toa_IR_forcing_histo_total')

ncdf_varget, cdfid, log_iwp_toa_net_forcing_M_histo_total_id, log_iwp_toa_net_forcing_M_histo_total
ncdf_varget, cdfid, log_iwp_toa_solar_forcing_M_histo_total_id, log_iwp_toa_solar_forcing_M_histo_total
ncdf_varget, cdfid, log_iwp_toa_IR_forcing_M_histo_total_id,log_iwp_toa_IR_forcing_M_histo_total
ncdf_varget, cdfid, log_iwp_atm_net_forcing_histo_total_id, log_iwp_atm_net_forcing_histo_total
ncdf_varget, cdfid, log_iwp_atm_solar_forcing_histo_total_id, log_iwp_atm_solar_forcing_histo_total
ncdf_varget, cdfid, log_iwp_atm_IR_forcing_histo_total_id,log_iwp_atm_IR_forcing_histo_total
ncdf_varget, cdfid, log_iwp_sfc_net_forcing_obs_histo_total_id,log_iwp_sfc_net_forcing_obs_histo_total
ncdf_varget, cdfid, log_iwp_sfc_solar_forcing_obs_histo_total_id, log_iwp_sfc_solar_forcing_obs_histo_total
ncdf_varget, cdfid, log_iwp_sfc_IR_forcing_obs_histo_total_id, log_iwp_sfc_IR_forcing_obs_histo_total
ncdf_varget, cdfid, log_iwp_sfc_net_forcing_histo_total_id, log_iwp_sfc_net_forcing_histo_total
ncdf_varget, cdfid, log_iwp_sfc_IR_forcing_histo_total_id, log_iwp_sfc_IR_forcing_histo_total
ncdf_varget, cdfid, log_iwp_sfc_solar_forcing_histo_total_id, log_iwp_sfc_solar_forcing_histo_total
ncdf_varget, cdfid, log_iwp_toa_net_forcing_histo_total_id, log_iwp_toa_net_forcing_histo_total
ncdf_varget, cdfid, log_iwp_toa_solar_forcing_histo_total_id, log_iwp_toa_solar_forcing_histo_total
ncdf_varget, cdfid, log_iwp_toa_IR_forcing_histo_total_id, log_iwp_toa_IR_forcing_histo_total

endif else begin	;OPENR, 1, fname, ERROR = err

; file does not exist, create it

write_forcing_histos, fname, log_iwp_bins, forcing_bins

endelse		;OPENR, 1, fname, ERROR = err


NCDF_CLOSE, cdfid

return
end