$\snippet{name: op_column, sign: '+', x: '241', y: '556', z: '797'}$
 
$\snippet{name: op_column, sign: '+', x: '238', y: '418', z: '656'}$
 
$\snippet{name: op_column, sign: '-', x: '797', y: '162', z: '635'}$
 
$\snippet{name: op_column, sign: '-', x: '829', y: '367', z: '462'}$