The movement of USDINR in September provides a clueto the timing of the transactions - in the absence of counterfactuals of what might have happened without RBI interventions.The INR strengthened in the first week of September - from 60.85 levels against the USD to 60.3 and then weakened sharply to 61.5 mid-September. Over September - the USD had strengthened secularly against other majors. ____________________________ RBI's USD purchase and sale would roughly have corresponded tothese periods.