Table 4: Results for broken power law fits for Mrk 421in the energy band 1.5-12.0 keV, assuming Galactic absorption.
Observation $\Gamma_{\rm low}$ $E_{\rm break}$ $\Gamma_{\rm high}$ $\chi^2_{\rm red}$ /d.o.f.

period keV

O165/A $2.62\pm0.01$ $6.25 \pm 0.51$ $3.19 \pm 0.22$ 1.029/475

O165/B $2.53\pm0.01$ $4.69 \pm 0.29$ $2.79 \pm 0.05$ 0.949/873

O165/C $2.60\pm0.01$ $4.92 \pm 0.46$ $2.82 \pm 0.07$ 0.940/673

O171-1/A $2.22 \pm0.01$ $4.66 \pm 0.11$ $2.64 \pm 0.03$ 1.071/1204

O171-1/B $2.38 \pm0.01$ $4.77 \pm 0.11$ $2.83 \pm 0.03$ 1.031/1154

O171-1/C $2.47 \pm0.01$ $4.27 \pm 0.13$ $2.88 \pm 0.03$ 1.015/ 969

**Table 4:** Results for broken power law fits for Mrk 421in the energy band 1.5-12.0 keV, assuming Galactic absorption.
Observation	$\Gamma_{\rm low}$	$E_{\rm break}$	$\Gamma_{\rm high}$	$\chi^2_{\rm red}$ /d.o.f.
period		keV
O165/A	$2.62\pm0.01$	$6.25 \pm 0.51$	$3.19 \pm 0.22$	1.029/475
O165/B	$2.53\pm0.01$	$4.69 \pm 0.29$	$2.79 \pm 0.05$	0.949/873
O165/C	$2.60\pm0.01$	$4.92 \pm 0.46$	$2.82 \pm 0.07$	0.940/673
O171-1/A	$2.22 \pm0.01$	$4.66 \pm 0.11$	$2.64 \pm 0.03$	1.071/1204
O171-1/B	$2.38 \pm0.01$	$4.77 \pm 0.11$	$2.83 \pm 0.03$	1.031/1154
O171-1/C	$2.47 \pm0.01$	$4.27 \pm 0.13$	$2.88 \pm 0.03$	1.015/ 969

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