Positioning an attenuator

att

prints the current positioned attenuator.

att <val>

positions attenuator <val>. Allowed attenuator numbers are: 0, 1, 2, 3, 4 and 5.

0 : square 50 mm x 50 mm slit, attenuation = 1
1 : circular 41 x diameter 0.4 mm slit, attenuation = 1/485
2 : circular 9 x diameter 2 mm slit, attenuation = 1/88
3 : circular 20 mm diameter slit, attenuation = 1/8
4 : circular 30 mm diameter slit, attenuation = 1/3.5
5 : circular 15 mm diameter slit, attenuation = 1/??