deadtime_simul

            modify evenly binned lightcurve (given by a time array
            and a count rate array) to take into account counting
            statistics; reproduce the effects of paralyzable (default)
            or nonparalyzable deadtime of a given length on the count
            rate; return modified count rate array

            timing tools

            deadtime_simul,time,orate,nrate,seed=seed,deadtime=deadtime, $
                       nonparalyzable=nonparalyzable
 INPUTS:    time  : time array of evenly binned lightcurve
            orate : corresponding count rate array

            none

            seed             : if set, the generation of random
                               numbers for the counting noise via
                               the idl-randomu routine, depends on the
                               given seed value
            deadtime         : length of deadtime, given in the same unit as
                               the time array; if no value is given,
                               the deadtime length is set to 0
            nonparalyzable   : if set, the effects of nonparalyzable
                               deadtime are calculated; if not set,
                               the effects of paralyzable deadtime
                               are calculated (for an explanation of
                               paralyzable and nonparalyzable deadtime, see:
                               Zhang, W., et al. 1995, Ap.J.,499, 930-935).

            nrate            : count rate array corresponding to
                               orate but modified by counting noise
                               and deadtime (if the deadtime length
                               is given)

            none

            none

            none

            the input lightcurve has to be equally binned and has to be
            given in count rates (not in photon numbers)

            uses the rndexp function

            deadtime_simul,findgen(1000),sin(2*!pi*0.005*findgen(1000))  $
                     *80.+100.,nrate,deadtime=0.001

            Version 1.0, 1998/03/09, Katja Pottschmidt, Joern Wilms,
                                     Sara Benlloch
                                     (benlloch@astro.uni-tuebingen.de)
            Version 2.0
                    3.0, 1998/11/27, Sara .... abs(avgdist)
            CVS Version 1.2, 2001/03/13 Joern Wilms
                    removed @-include statement at top to avoid IDL
                    compilation error

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