[Reference] Number of Telephone Subscriber Services Notes: 1. "Number of Telephone Subscriber Lines" is the total of individual lines and central station lines.   2. In terms of number of channels, transmission rate, and line use rate (base rate), INS-Net 1500 is in all cases roughly ten times greater than INS-Net 64. For this reason, one INS-Net 1500 subscriber is calculated as ten INS-Net 64 subscribers .   3. "Number of Cellular" includes the DoPa Single Service subscribers.   * Partial listing only. Indicators Notes:     1. EBITDA Margin = (Operating income + DA) / Operating revenues   2. Operating Free Cash Flow = Operating income + DA - Capital investment   3. ROCE = Operating income * (1 - Statutory tax rate) / Operating capital employed   * DA (Depreciation and amortization, Loss on disposal of property, plant and equipment) : [March 31,2005]2,328.4 billion yen[March 31,2004]2,373.5 billion yen   * Capital investment : See figures in the table of "Capital Investements" below.   * Operating capital employed : [March 31,2005]12,307.0billion yen[March 31,2004]12,324.0 billion yen   * Statutory tax rate : [March 31,2005] 41% [March 31,2004] 42% Note: The figures represent the accrual-based amounts required for acquisition of property, plant and equipment, and intangibles. Copyright (c) 2005 Nippon telegraph and telephone corporation