Nice. Laghu Vasudeva Mananam describes four characteristics of Atman:
1. The Atman is different from the gross body, subtle body and the causal body.
2. The Atman is different from the five sheaths.
3. The Atman is the Witness of the three states of waking, dreaming and deep sleep.
4. The nature of the Atman is Sat Chit Ananda.
Of these four characteristics of the Atman, the first two are obtained through elimination, Vyavritti Lakshana.
The third is the contiguous feature, Tatastha Lakshana and the fourth is the direct experiential feature, Svarupa Lakshana.
The two invocatory verses of Ulladu Narpadu, speak of Tatastha Lakshana and Swarupa Lakshana of Atman i.e Ulladhu.