lc_done

          Simulate a light-curve with a power-law distributed
          periodogram

          light curve simulation

          lc_done,time,rate,nt=nt,beta=beta,sigma=sigma,mean=mea, $
            seed=seed,dt=dt

          -

          nt: Number of bins of the simulated lightcurve (default:65536)
        beta: Power law index of the periodogram (default: 1.5)
        mean: Mean count rate of the simulated lightcurve (default: 0.)
       sigma: Standard deviation of the lightcurve to be simulated
              (default:1.)
        seed: Seed for the random number generator (returned if not
              defined -- see IDL help for randomu function)
        fact: Factor introduced by Merrifield & McHardy 1994, MNRS
              271, 899 for the Fourier freq. array dimension to
              explore the effects of the low-freq. component in the
              PSD. They used fact = 10. If not set, then fact = 1.
          dt: time resolution of the lightcurve

        time: Time array (trivial :-) )
        rate: Array of countrates of length nt

        seed: see above

        Version 1.0, 2002/01/10, Sara Benlloch, IAAT

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