From https://sreenivasaraos.com

" And, a major part of 243 verses of Dattilam is about Gandharva. The Verse Six of Dattilam mentions that the text aims to discuss, mainly: Sruti (micro tone intervals), Svara (notes) , Grama (systems), Murchana (scales) consisting series of notes (Tana)
, Sthana (voice registers) , Vritti (styles) , Suska or A-gita (playing on Veena following vocal style but without singing) and Sadharana (two ways of over lapping). "

" 10.1. It is said; there were four types of Murchanas: Purna (full), the heptatonic with all the seven Svaras; Shadava (hexatonic) with six Svaras; Audava (Pentatonic) with five Svaras; and, Tanas or Sadharani-krta (including overlapping notes, like
Kakili Nishada).

kramayuktāḥ svarāḥ sapta mūrcchanetyabhisaṃjñitāḥ । ṣaṭpañ ca svara kāstānāḥ, ṣāḍavau ḍuvitāśrayāḥ ॥ 28.32॥ sādhāraṇakṛtāś caiva kākalī samalaṅkṛtāḥ । antara svara saṃyuktā mūrcchanā grā
mayordvayoḥ ॥ NS.28.33॥

Natyashastra mentions: The variety of Tanas and Murchanas, thus arising, provide enjoyment to the listeners and to the musicians, as well. They do help the singer in improving his voice registers (sthana-prapti)."

- https://books.google.at/books?id=6HFKEAAAQBAJ&pg=PT302&lpg=PT302&dq=natyashastra++tana&source=bl&ots=buIvEQZY59&sig=ACfU3U1vFziU_I27FC7mACAfcqFS72zgvg&hl=de&sa=X&ved=2ahUKEwjNlZHFpqv8AhX-gP0HHXX3CcA4FBDoAXoECBUQAw#v=onepage&q=natyashastra%20%20tana&f=
false

" Tana is the murchana in which 1 or 2 specific notes are dropped " ( Cannot copy and paste )

There existed a website about Bharatnatyam by a Russian dancer and I think she had some audio files reconstructing these tanas ... ?
Unfortunately it is not online anymore .

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