Grob *common = common_refpoint_of_array (notes, rcol, Y_AXIS);
Interval restdim = rcol->extent (common, Y_AXIS);
if (restdim.is_empty ())
Grob *common = common_refpoint_of_array (notes, rcol, Y_AXIS);
Interval restdim = rcol->extent (common, Y_AXIS);
if (restdim.is_empty ())