Natyashastra
इत्येवावन्तिपाञ्चालदाक्षिणात्यौढ्रमागधैः । कर्तव्य पूर्वरङ्गस्तु द्विप्रमाणविनिर्मितः ॥ १७३॥
Thus, the preliminary act should be performed by the inhabitants of Avantī, Pāñchāla, Dakṣiṇātya, and Māgadha, constructed with the measure of two parts.
english translation
ityevAvantipAJcAladAkSiNAtyauDhramAgadhaiH । kartavya pUrvaraGgastu dvipramANavinirmitaH ॥ 173॥
hk transliteration by Sanscript