(b) if no quotation for the relevant period is displayed and there is no alternative service on which a quotation is displayed, "LIBOR" shall mean the arithmetic mean (rounded upwards, if not already such a multiple, to the nearest whole multiple of one-sixteenth of one per cent. (1/16th of 1%)) of the rates at which each of the Reference Banks was offering to prime banks in the London Interbank Market deposits in Dollars in similar amounts and for such period at or about
11.1 a.m. (London time) on the Quotation Date for such period.