Latitude	Weight_SIRM	Weight_CCIR	foF2_{BUFFER ZONE}
l = 50	1.0	0.0	foF2_SIRM × 1.0 + foF2_CCIR × 0.0
l = 51	0.9	0.1	foF2_SIRM × 0.9 + foF2_CCIR × 0.1
l = 52	0.8	0.2	foF2_SIRM × 0.8 + foF2_CCIR × 0.2
l = 53	0.7	0.3	foF2_SIRM × 0.7 + foF2_CCIR × 0.3
l = 54	0.6	0.4	foF2_SIRM × 0.6 + foF2_CCIR × 0.4
l = 55	0.5	0.5	foF2_SIRM × 0.5 + foF2_CCIR × 0.5
l = 56	0.4	0.6	foF2_SIRM × 0.4 + foF2_CCIR × 0.6
l = 57	0.3	0.7	foF2_SIRM × 0.3 + foF2_CCIR × 0.7
l = 58	0.2	0.8	foF2_SIRM × 0.2 + foF2_CCIR × 0.8
l = 59	0.1	0.9	foF2_SIRM × 0.1 + foF2_CCIR × 0.9
l = 60	0.0	1.0	foF2_SIRM × 0.0 + foF2_CCIR × 1.0