TRIPP_WRITE_ERROR

       Compute error of light curve from rms information

       Astronomical Photometry.

       TRIPP_WRITE_ERROR, LOGNAME = logName, [/silent]

       - IDL SAVE file *_IDL.FIN" (created by tripp_write_final,
                              contains tclear/fclear)
       - IDL SAVE file *.RMS (created by tripp_calc_relflux,
                              contains time/fneu/ferr)

       ASCII file '*.err' containing error values for all data points.
       IDL SAVE file '*_idl.err' - Contains the error column stored in an
                              IDL save file. The only variable saved
                              is "error".

       silent - Do not plot intermediate results.

       file type:      _idl.FIN as produced by TRIPP_WRITE_FINAL
                       RMS as produced by TRIPP_CALC_RELFLUX
       Input directory and filename structure as specified in Log

       Version 2.0  2008/01 IT, completely revised
                                /photon (default):
                                  new approach via photon statistics,
                                  individual errors (by TRIPP_CALC_RELFLUX),
                                  combined in weighted error propagation,
                                /stdev: old version on the basis of the
                                  standard deviations of the reference stars,
                                  to be used with a large sample of refs
                                mean flux, rms and relative flux deviation
                                added to standard output
                    2008/02 IT, calculation of weighted error shifted to
                                TRIPP_CALC_RELFLUX (ferrweight)
                                in consequence modification of scaling factor
                                for ferrweight/ferrclear
       Revision 1.11  2004/01/19 14:03:40  schuh
        Modified Files:
               tripp_write_error.pro   SLS, cosmetics: standard output
       Revision 1.10  2003/07/09 08:29:56  goehler
       bug fix: add properly time shifts for clean data recognition
       Revision 1.9  2003/03/13 10:32:42  goehler
       added CLOSEST option to look for closest error instead of using inter/extrapolation.
       In cases of low source fluxes it is prudent to overestimate the error with this option.
       Revision 1.8  2003/02/20 16:50:27  goehler
       now also cleaned data may be selected to be used as reference (this is also a good test
       whether tripp_write_final was used properly)
       Revision 1.7  2003/02/20 16:48:57  goehler
       Revision 1.6  2002/11/12 13:26:14  goehler
       made more error-prone (ranges fixed, check ref-star existence)
       Revision 1.5  2002/09/18 08:42:44  schuh
        Modified Files:
               tripp_write_error.pro  inf file -> fin file
       Revision 1.4  2002/09/18 08:01:11  goehler
       Change: use *.fin results instead *.dat thus adding the error
       to the final product.
       Revision 1.3  2002/09/17 14:35:49  goehler
       fix of silent logic
       Revision 1.2  2002/09/17 14:06:09  goehler
       cosmetics
       Revision 1.1  2002/09/17 13:44:15  goehler
       Initial version.
       Derived from S. Dreizlers tripp_measure_sigma.pro.

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