TUV for GECKO
THIS IS TUV_V4.2_GECKO
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Updates May 2018, Julia Lee-Taylor, NCAR-ACOM & CIRES
- Codes for nitrooxy ketones changed from 70200 & 70100 to 
  40002 & 40003 respectively for compatability with generator
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Updates April 2018, Sasha Madronich, NCAR-ACOM
- Updated subroutine rdlamp.f to exclude atmos column effects &
  correct for xsections in quanta/cm2/s
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Updates June 2017, Julia Lee-Taylor, NCAR-ACOM & CIRES
- Added x-section datapoints at 185nm & 254nm for OFR simulations 
  (see README_VERSION_OFR.txt for details, data relevant to propane)
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Updates Feb 2015, Julia Lee-Taylor, ACD, NCAR
- CH3ONO rxn added with code 40000: j-values are identical to NO2
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Updates Dec 2012, Julia Lee-Taylor, ACD, NCAR
- HCHO rxn codes are now 110 and 17
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How To Run:
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- make, run executable 'tuv'
- use interactive dialog to set:
      date (iyear, imonth, iday) 
      altitude (zout)
      clouds (taucld, zbase, ztop)
      aerosol radiative properties (tauaer, ssaer, alpha)
- or use a pre-defined input file with 6-character name, see examples in
  PHOTFILES/INPFILES
- use lzenit = T, nt = 11, tstart = 0, tstop = 90
- outputs for GECKO will be at SZA = {0, 10, ....60, 70, 78, 86}
- output is in file fort.90  Copy this to PHOTFILES/yourfile.phot

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Aspiration for future development: 
Rework so that GECKO output uses codes and j-values from TUV, where
possible.  GECKO data files will need to be made consistent with this
scheme.
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