Function: mean(gradient[1](minus(numbers('rrr'), numbers('epe')) if numbers('epe') > numbers('rrr') else minus(numbers('rrr'), numbers('epe')) if numbers('rrr') > numbers('rrr') else numbers('epe')), numbers('epe') if numbers('epe') if numbers('rrr') > numbers('rrr') else minus(numbers('rrr'), numbers('epe')) > numbers('rrr') else minus(numbers('rrr'), numbers('epe')))
