Amount ng per spot For ropinirole standard SD %RSD Intra-day precision 600 15.91 0.52 900 7.37 0.18 1200 19.28 0.40 Inter-day precision 600 19.18 20.06 900 25.44 0.06 1200 20.26 0.04 *mean of six estimations at each level

Table 1: Intra-day and Inter-day Precision*.