These are the results:

Statistic for up-left quadrant:

Integration time	Y(calc)	Y(exper)	Dispersion
12	16208	16036	1.0%
14	18866	18637	1.2%
17	22872	22452	1.8%
30	40195	38772	3.6%
40	53521	50446	6.1%

Statistics for down-left quadrant:

Integration time	Y(calc)	Y(exper)	Dispersion
14	19748	19671	0.4%
17	23923	23690	1.0%
20	28122	27737	1.3%
30	42079	40806	3.2%
40	56036	53123	5.2%

Statistics for up-right quadrant:

Integration time	Y(calc)	Y(exper)	Dispersion
14	18016	17922	0.5%
17	21829	21588	1.1%
25	31997	31345	2.1%
35	44706	43267	3.3%
40	51063	48786	4.6%

Statistics for down-right quadrant:

Integration time	Y(calc)	Y(exper)	Dispersion
14	18907	18785	0.6%
17	22925	22640	1.2%
25	33633	32880	2.2%
35	47022	44993	4.5%
40	53727	50676	6.0%

Statistics for whole frame:

Integration time	Y(calc)	Y(exper)	Dispersion
14	18837	18738	0.5%
17	22828	22531	1.3%
25	33469	32829	1.9%
30	40120	39061	2.7%
40	53420	50752	5.3%

These are the fitting parameters of a third order polynomial for each quadrant:
 

Quadrant	Midpt (x:=time)	Correlation
1	-0.26x3+13.2x2+1121x+805	0.9997
2	-0.42x3+24.1x2+1050x+1109	0.9977
3	-0.22x3+11.4x2+1094x+742	0.9998
4	-0.30x3+17.29x2+1005x+1897	0.9994
Frame	-0.27x3+13.9x2+1118x+829	0.9997

If you want to get graphics click here

 Up-left quadrant
 Down-left quadrant
 Up-right quadrant
 Down-right quadrant
  Full Array