open_valve()

set_pol_cplus(offset = -7)
set_file('Gd_hyst_plus')
hyst_cont(field_x, 6.5, -6.5, 2.0, [1181.6, 1172.8])

set_pol_cplus(offset = -7)
set_file('Gd_hyst_plus')
hyst_cont(field_x, -6.5, 6.5, 2.0, [1181.6, 1172.8])

set_pol_cminus(offset = -2.5)
set_file('Gd_hyst_minus')
hyst_cont(field_x, 6.5, -6.5, 2.0, [1181.6, 1172.8])

set_pol_cminus(offset = -2.5)
set_file('Gd_hyst_minus')
hyst_cont(field_x, -6.5, 6.5, 2.0, [1181.6, 1172.8])

close_valve()