}
dims = get_property ("minimumVerticalExtent");
if (gh_pair_p (dims) && gh_number_p (ly_car (dims))
&& gh_number_p (ly_cdr (dims)))
}
dims = get_property ("minimumVerticalExtent");
if (gh_pair_p (dims) && gh_number_p (ly_car (dims))
&& gh_number_p (ly_cdr (dims)))