nisadavati_amsas_and_nyasa
In niṣādavatī (=naiṣādī), gāndhāra, niṣāda, ṛṣabha are the aṁśas (and grahas); niṣāda is the nyāsa (eponymous svara).
Body (pseudocode)
nisadavati := {amsas: [gandhara, nisada, rsabha], grahas: [nisada, rsabha, gandhara], nyasa: nisada}