variable  newton_pair     index  on
variable  newton_bond     index  on

neigh_modify     delay 2 every 2 check no
timestep         0.0001
newton           ${newton_pair} ${newton_bond}

if $(is_defined(variable,pair_style)) then "pair_style ${pair_style}"
if $(is_defined(variable,read_data))  then "read_data  ${data_file}"