 - Moxifloxacin 400 mg positive control; over encapsulated, oral Subjects will be screened for study participation from Days -21 to -2 and admitted to the clinic on Day -2 of Period 1 for prestudy assessments. On Day -1 of each period, subjects will undergo a full day of continuous 12 lead Holter monitoring; 4 ECGs will be extracted from the H 12 flash card approximately 1 minute apart at 0.5, 1, 2, 3, 4, 5, 6, 8, 10, 12, 18, and 23 hours. 