During morning Sandhyavandanam, we raise the legs slightly to offer arghyam. For the followers of Sama Veda, how many times should they offer arghyam during madhyahnikam and evening Sandhyavandanam? How many times is the maha nyasam done? In which chandas must the Gayatri mantra be recited? (Is it Devi Gayatri or Nrucat Gayatri)?