open_valve()

set_pol_cminus(offset = 2.0)
set_file('Co_hyst_minus')
hyst_cont(field_x, 6.8, -6.8, 2.0, [777.4, 774.4])

set_pol_cplus(offset = 0.0)
set_file('Co_hyst_plus')
hyst_cont(field_x, -6.8, 6.8, 2.0, [777.4, 774.4])

set_pol_cplus(offset = 0.0)
set_file('Co_hyst_plus')
hyst_cont(field_x, 6.8, -6.8, 2.0, [777.4, 774.4])

set_pol_cminus(offset = 2.0)
set_file('Co_hyst_minus')
hyst_cont(field_x, -6.8, 6.8, 2.0, [777.4, 774.4])

close_valve()