zhangfunction

         calculate and return the value of the defined ancillary
         functions  to obtain the autocovariance function in the
         nonparalyzable dead time case, for the article of Zhang et
         al., "Dead-time modifications to fast Fourier transform
         power spectra", The Astrophysical Journal, 449:930-935, 1995

         timing tools

         zhangfunction(k,nind,deadt,incrate,bt)

         k       : autocovariance function index, k = 0,.....nbin-1
         nind    : summation index, n = 1,....infinite
         deadt   : length of deadtime
         incrate : mean incident event rate of lightcurve
         bt    : bintime of lightcurve

         none

         none

         zhangfunction : h(k,n), eq. 35 in ApJ 449, 930, 1995

         none

         none

         none

         see procedure zhangpsd

         none

         zhangfunction(2,4,10E-6,20000,1E-6)

         Version, 1998/03/12, Sara Benlloch (IAAT)
                              ([email protected])

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