The assimilated nasal element, whether viewed as nasalized vowel, nasal semivowel, or independent anusvāra, has the value of something added, in making a heavy syllable, or length by position (79).

a. The Prātiçākhyas (VPr., RPr.) give determinations of the quantity of the anusvāra combining with a short and with a long vowel respectively to make a long syllable.