Table 4: Reduced $\chi ^2$ values for the best fit spectra of Mkn 421 with a power law with exponential cutoff and a log-parabola for the 1999-2000 observations.
Date PL+EC Log P d.o.f.

1999-05 4.16 1.11 141

     I 1.57 1.11 111

    II 3.22 1.14 111

   III 2.51 1.06 111

   IV 1.77 1.04 111

2000-04 13.11 1.06 152

     H 8.13 1.01 152

     F 8.21 1.06 152

2000-05 7.89 1.34 149

     I 5.82 1.37 149

    II 2.77 1.03 136

   III 2.87 1.26 136

   IV 2.14 0.87 136

    V 1.67 1.00 121

**Table 4:** Reduced $\chi ^2$ values for the best fit spectra of Mkn 421 with a power law with exponential cutoff and a log-parabola for the 1999-2000 observations.
Date	PL+EC	Log P	d.o.f.
1999-05	4.16	1.11	141
I	1.57	1.11	111
II	3.22	1.14	111
III	2.51	1.06	111
IV	1.77	1.04	111
2000-04	13.11	1.06	152
H	8.13	1.01	152
F	8.21	1.06	152
2000-05	7.89	1.34	149
I	5.82	1.37	149
II	2.77	1.03	136
III	2.87	1.26	136
IV	2.14	0.87	136
V	1.67	1.00	121

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