open

set pol c+ off -1.5
otf 420 480 2 delay 10
file BiE_plus
start

set pol c+ off -1.5
otf 420 480 2 delay 10
file BiE_plus
start

set pol c- off 0
otf 420 480 2 delay 10
file BiE_minus
start

set pol c- off 0
otf 420 480 2 delay 10
file BiE_minus
start

set pol c+ off -1.5
otf 420 480 2 delay 10
file BiE_plus
start

set pol c+ off -1.5
otf 420 480 2 delay 10
file BiE_plus
start

set pol c- off 0
otf 420 480 2 delay 10
file BiE_minus
start

set pol c- off 0
otf 420 480 2 delay 10
file BiE_minus
start

set pol c+ off -1.5
otf 420 480 2 delay 10
file BiE_plus
at_end close
start