Table 2: Parameters of the power law fit to the differential spectrum for the different darkness periods of HESS observations on PSR B1259-63. For the periods May and June 2004, no spectrum could be derived due to insufficient statistics. Shown are the photon index $\Gamma $ and the flux normalisation $F_{\rm0}$ (with statistical error only), the $\chi ^2$ per number of degrees of freedom $\chi ^2/{\rm ndf}$ and the $\chi ^2$ probability  $P_{\chi ^2}$ for the power law fit of the spectrum, and the corresponding mean threshold energy $E_{\rm th}$ (rounded to 10 GeV).
Period $\Gamma $ $F_{\rm0}$ $\chi^2/$ $P_{\chi ^2}$ $E_{\rm th}$
2004   ${\rm [TeV}^{-1}~~{\rm cm}^{-2}~~{\rm s}^{-1}]$ ${\rm ndf}$   $[{\rm GeV}]$
February $2.8\pm0.3$ $2.1\pm0.3\times10^{-12}$ 1.8/4 0.77 370
March $3.0\pm0.6$ $1.0\pm0.2\times10^{-12}$ 1.8/4 0.76 420
April $2.8\pm0.4$ $2.0\pm0.3\times10^{-12}$ 0.4/3 0.93 350
Overall* $2.7\pm0.2$ $1.3\pm0.1\times10^{-12}$ 2.3/5 0.81 380

* Includes all data from February to May 2004.

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