“…However, in practice, these values may change with dopinglevel 26 or with temperatures due to the correlation effects 27,69,70 . Although recently the effects of correlations on HHG beyond the phenomenological description have been attracting much interest [70][71][72][73][74][75][76][77][78][79][80][81][82][83] , deeper understanding is required for further accurate understanding of behavior of HHG. This is an important future task.…”