30 The submissions advanced in support of the contention that the sentence is manifestly excessive focus upon the quantity of heroin, the fact that it was accepted that the applicant was a courier, and that she was a woman of low cognitive ability. The applicant seeks to call in aid the range of sentences promulgated by the Court of Criminal Appeal in R v Wong and Leung [1999] NSWCCA 420 for couriers and persons low in the hierarchy where a low level trafficable quantity has been imported. The low level trafficable quantity was identified by the Court as between 2g and 200g. As the applicant acknowledges, the range of five to seven years imprisonment was "determined primarily on the basis of existing sentencing patterns" [142], which were established against the backdrop of section 16G of the Crimes Act, and was premised on a plea of guilty. In addition, it must be borne in mind that the High Court has disapproved of the practice of placing too great an emphasis on the amount of the drug in assessing the appropriate sentence : Wong v the Queen (2001) 207 CLR 584 at 609 ; see also Markarian v The Queen [2005] HCA 25. Nonetheless, the applicant argues that a starting point of 10 years imprisonment, before the application of the discount for an early plea of guilty, was outside the range appropriate to a courier, importing a low range trafficable quantity, with the subjective features of the applicant.