1
2
nW/cm2/sr
> 32
3
4
16-32
Brighter
8-16
4-8
2-4
1-2
5
Darker
0.5-1
0.25-0.5
6
< 0.25
150 km
7
150 miles
1 Tomintoul and Glenlivet
5 Usk reservoir
6 Dunkery Beacon
2 Kielder Observatory
3 Low Gillerthwaite field centre
7 Winchester
Science Centre
4 Dalby Forest
1
2
3
4
nW/cm2/sr
> 32
16-32
Brighter
8-16
5
4-8
2-4
1-2
6
Darker
0.5-1
0.25-0.5
150 km
7
< 0.25
150 miles
1 Tomintoul and Glenlivet
5 Usk reservoir
2 Kielder Observatory
6 Dunkery Beacon
3 Low Gillerthwaite field centre
7 Winchester Science Centre
4 Dalby Forest