पञ्चभागावरो मध्यमावरयोः ॥ कZ_०२.३०.१७ ॥
pañca-bhāgāvaro madhyamāvarayoḥ
For the middle and lower grades, it is reduced by one-fifth (from the first-rate standard).
They supply two complementary downgrade logics—absolute (aṅgula) and proportional (one-fifth)—usable across different measurements or contexts of assessment.