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In page Ayu Khandro:

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Yet in 1865, at 77, Togden Rangrig died. The sign of an accomplished meditator his body remained in final meditation posture, tukdam,[citation needed] for seven days. After this period his body was the size of an eight year old. This dissolution of the body into the elements at the time of death is called the rainbow body and is the highest attainment of Dzogchen meditation.[1] At the time of cremation signs of the meditative realization of the practitioner can appear. and at Ayu Khandro was present for this, and she recalled: " As we were making the funeral pyre and preparing the body to be burned everyone heard a loud noise like a thunderclap. A strange half-snow half-rain fell."[2]