Nuances on the origin of tArA(entirely) in Tibet (in general)

1. Tibetan tradition states that tArA herself was introduced into Tibet from Nepalese sources(the daughter of aMshuvarman),who got a sandalwood image of the devI when she married the first great Tibetan king Songtsen Gampo
2. Bauddha tradition mentions just those two forms as introduced by nAgArjuna from bhoTadesha:ekajaTA and possibly vajratArA(from the sAdhanAmAlA)
3. The 6-7th century aShTA~NgasaMgraha mentions tArA and mercury(nAgArjuna gets associated with rasAyana siddhis too in that tradition),but no mention of nAgArjuna.
4. ekajaTA,who is iconographically very similar to mahAchInakrama-tArA(and often identical) got incorporated into Astika sAdhanAs through the means of the pheTkariNI/pheTkarIya tanta which was quoted by AgAmavAgIsha in his bR^ihat tantrasAra,which popularised this form of tArA over other forms.(and these were the forms associated with the story of vasiShTha going over to mahAchIna and recieving the mantra from nArAyaNa in the form of buddha)