Man pages matching name qwtscalediv in section 3:

QwtScaleDiv.3.en	debian 10 / libqwt-doc
QwtScaleDiv.3.en	debian 10 / libqwt5-doc
QwtScaleDiv.3.en	debian 11 / libqwt-doc
QwtScaleDiv.3.en	debian 12 / libqwt-doc