2.3.2. [DEL] a3c0
2.3.2. Sample B
B4: in the case of A2
one retro-reflector more than 0 per cent
but not more than 20 per cent
one retro-reflector more than 20 per cent
B5: in the case of A2
both retro-reflectors more than 20 per cent
B6: in the case of A2
one retro-reflector 0 per cent
one retro-reflector more than 30 per cent 		a0c0