For the sandhi in the Vedas and Aranyakas which of the following is more correct (i.e. t-s or th-s):
स॒र्वेऽस्मात्स्यन्द॑न्ते॒ sa̱rve'smātsyanda̍nte̱
स॒र्वेऽस्माथ्स्यन्द॑न्ते॒ sa̱rve'smāthsyanda̍nte̱
This example is from the Mahanarayana Upanishad section 12.3 (Taittiriya Aranyaka 10.12.3).
The first example is from Mahanarayanopanishad by Swami Vimalananda, p125. The second is from Mantra Pushpam by the Ramakrishna Math, p41.
You guys were so helpful in my previous question regarding visarga sandhi, I'm assuming that the answer here is simliar in that both may be correct and the second is more of a South-Indian style, but I wanted to make sure. I'm afraid I couldn't find this in any of the grammars because I'm not sure what the original words would have been (before the sandhi).