Table 2: Spectral parameters of the LP model of time resolve spectra for the 0.5-10 XMM-Newton EPIC-MOS observations of Mrk 421.
Date $E_{\rm p} ^*$ b $S_{\rm p}^{**}$ $\chi^2_{r}~({\rm d.o.f.})$

01/11/00 0.22 (0.08) 0.25 (0.05) 132.8 (9.6) 0.86 (174)

0.22 (0.04) 0.23 (0.02) 124.8 (4.8) 0.95 (307)

0.31 (0.06) 0.28 (0.03) 136.0 (4.8) 1.12 (225)

13/11/00 1.09 (0.04) 0.27 (0.02) 340.6 (1.0) 1.06 (372)

0.92 (0.03) 0.40 (0.02) 342.9 (1.1) 1.07 (363)

08/05/01 0.74 (0.05) 0.35 (0.02) 254.4 (1.6) 1.01 (285)

0.82 (0.04) 0.27 (0.02) 263.5 (11) 1.23 (347)

0.85 (0.04) 0.37 (0.02) 249.4 (1.1) 1.11 (311)

04/05/02 0.39 (0.07) 0.49 (0.06) 147.2 (6.4) 0.98 (139)

0.38 (0.06) 0.46 (0.05) 144.0 (6.4) 1.06 (154)

0.44 (0.06) 0.56 (0.06) 120.0 (4.8) 0.96 (153)

05/05/02 0.23 (0.04) 0.44 (0.04) 102.4 (6.4) 0.98 (186)

14/11/02 1.43 (0.04) 0.39 (0.03) 347.2 (1.6) 1.00 (221)

2.0 (0.1) 0.32 (0.05) 380.8 (4.8) 1.22 (155)

01/12/02 0.87 (0.05) 0.41 (0.03) 172.6 (1.1) 1.01 (228)

0.72 (0.07) 0.38 (0.04) 169.6 (1.2) 1.10 (195)

0.67 (0.06) 0.40 (0.04) 167.7 (1.4) 0.91 (212)

02/12/02 0.64 (0.05) 0.34 (0.03) 196.8 (1.6) 1.00 (216)

0.83 (0.08) 0.35 (0.04) 227.2 (1.6) 1.08 (190)

02/06/03 0.36 (0.08) 0.45 (0.06) 51.2 (3.2) 1.09 (139)

14/11/03 1.20 (0.03) 0.43 (0.02) 467.2 (1.6) 1.15 (321)

0.79 (0.04) 0.48 (0.03) 441.6 (3.2) 1.10 (240)

10/12/03 0.87 (0.05) 0.38 (0.03) 209.1 (1.1) 1.04 (274)

0.89 (0.05) 0.42 (0.03) 207.2 (1.3) 1.17 (240)

06/05/04 1.74 (0.04) 0.33 (0.03) 432.0 (1.6) 1.09 (332)

2.4 (0.1) 0.24 (0.02) 494.4 (3.2) 1.24 (335)

07/11/05 0.9 (0.1) 0.38 (0.06) 284.8 (3.2) 1.06 (145)

0.8 (0.1) 0.44 (0.07) 296.0 (4.8) 1.04 (125)

09/11/05 0.63 (0.03) 0.40 (0.02) 420.8 (3.2) 1.27 (365)

0.71 (0.04) 0.41 (0.02) 430.4 (3.2) 1.25 (302)

0.68 (0.04) 0.36 (0.02) 460.8 (3.2) 1.16 (300)

0.79 (0.05) 0.40 (0.03) 505.6 (3.2) 1.22 (266)

(*) $E_{\rm p}$ in keV.
(**) $S_{\rm p}$ in 10^-12erg cm^-2 s^-1.

**Table 2:** Spectral parameters of the LP model of time resolve spectra for the 0.5-10 *XMM-Newton* EPIC-MOS observations of Mrk 421.
Date	$E_{\rm p} ^*$	b	$S_{\rm p}^{**}$	$\chi^2_{r}~({\rm d.o.f.})$
01/11/00	0.22 (0.08)	0.25 (0.05)	132.8 (9.6)	0.86 (174)
	0.22 (0.04)	0.23 (0.02)	124.8 (4.8)	0.95 (307)
	0.31 (0.06)	0.28 (0.03)	136.0 (4.8)	1.12 (225)
13/11/00	1.09 (0.04)	0.27 (0.02)	340.6 (1.0)	1.06 (372)
	0.92 (0.03)	0.40 (0.02)	342.9 (1.1)	1.07 (363)
08/05/01	0.74 (0.05)	0.35 (0.02)	254.4 (1.6)	1.01 (285)
	0.82 (0.04)	0.27 (0.02)	263.5 (11)	1.23 (347)
	0.85 (0.04)	0.37 (0.02)	249.4 (1.1)	1.11 (311)
04/05/02	0.39 (0.07)	0.49 (0.06)	147.2 (6.4)	0.98 (139)
	0.38 (0.06)	0.46 (0.05)	144.0 (6.4)	1.06 (154)
	0.44 (0.06)	0.56 (0.06)	120.0 (4.8)	0.96 (153)
05/05/02	0.23 (0.04)	0.44 (0.04)	102.4 (6.4)	0.98 (186)
14/11/02	1.43 (0.04)	0.39 (0.03)	347.2 (1.6)	1.00 (221)
	2.0 (0.1)	0.32 (0.05)	380.8 (4.8)	1.22 (155)
01/12/02	0.87 (0.05)	0.41 (0.03)	172.6 (1.1)	1.01 (228)
	0.72 (0.07)	0.38 (0.04)	169.6 (1.2)	1.10 (195)
	0.67 (0.06)	0.40 (0.04)	167.7 (1.4)	0.91 (212)
02/12/02	0.64 (0.05)	0.34 (0.03)	196.8 (1.6)	1.00 (216)
	0.83 (0.08)	0.35 (0.04)	227.2 (1.6)	1.08 (190)
02/06/03	0.36 (0.08)	0.45 (0.06)	51.2 (3.2)	1.09 (139)
14/11/03	1.20 (0.03)	0.43 (0.02)	467.2 (1.6)	1.15 (321)
	0.79 (0.04)	0.48 (0.03)	441.6 (3.2)	1.10 (240)
10/12/03	0.87 (0.05)	0.38 (0.03)	209.1 (1.1)	1.04 (274)
	0.89 (0.05)	0.42 (0.03)	207.2 (1.3)	1.17 (240)
06/05/04	1.74 (0.04)	0.33 (0.03)	432.0 (1.6)	1.09 (332)
	2.4 (0.1)	0.24 (0.02)	494.4 (3.2)	1.24 (335)
07/11/05	0.9 (0.1)	0.38 (0.06)	284.8 (3.2)	1.06 (145)
	0.8 (0.1)	0.44 (0.07)	296.0 (4.8)	1.04 (125)
09/11/05	0.63 (0.03)	0.40 (0.02)	420.8 (3.2)	1.27 (365)
	0.71 (0.04)	0.41 (0.02)	430.4 (3.2)	1.25 (302)
	0.68 (0.04)	0.36 (0.02)	460.8 (3.2)	1.16 (300)
	0.79 (0.05)	0.40 (0.03)	505.6 (3.2)	1.22 (266)

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