INTEGRAL/SPI data segmentation to retrieve source intensity variations

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Table 2

“Image-space” method final chi-square.

Dataset	4U 1700-377	GX 339-4^*	GX 1+4^*	4U 1700-377^*
exposures	4112	1183	4246	4112
sources	142	120	140	142

All sources are assumed to have constant intensity
(d.o.f.)	6.15(71 594)	2.46(19 308)	1.81(69 361)	2.01(67 483)
n _seg	1	1	1	4112
“Time bins” from IBIS light curves after S/N scaling (Sect. 6.2.2)
(d.o.f.)	1.28(68 455)	1.186(18 880)	1.193(68 557)	1.186(66 588)
n_seg	2245	17	122	4112
“Time bins” from IBIS light curves directly
(d.o.f.)	1.132(65 768)	1.106(18 317)	1.143(66 939)	1.124(64 841)
n_seg	3185	46	675	4112

Notes.

^(*)

The source 4U 1700-377 is also contained in the FoV and is set to be variable on the exposure duration timescale (~1 h).

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