if opt_first_line.value != 0 then v.first_line = opt_first_line.value
if opt_last_line.value != 0 then v.last_line = opt_last_line.value
if opt_first_line.value != 0 then v.first_line = opt_first_line.value
if opt_last_line.value != 0 then v.last_line = opt_last_line.value