Great effort Shri.Ramachandar and Shri praveen for publishing the mantras.
Can I take this opportunity to correct a long-held but incorrect belief?
When performing Brahma yagnam, everone can and should do pitru tharpanam part.
Both Sringeri and Kanchi Mathas have clarified this. The xplanation being, pitrus includes grand parents, great grand parents etc and we need to offer tharpanam to them irrespective of whether our own parents are alive or not.
My two cents worth.. Thanks for listening.
Subramanian.