Manasara 18.83

18.83

eṣā mūrdhnīṣṭakā proktā lupālakṣaṇamucyate
lupālakṣaṇam
stūpituṅgadvayaṃ vātha vimānaṃ ca vaśodayam

This has been declared as the crown brick; now the characteristic of the rafter is stated.
[The Characteristic of the Rafter]
Either two [times] the height of the finial, or the temple tower may have an elevation according to choice;