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! cet87.scl ! Least-squares stretched ET to telephone dial tones. 1/1=697 Hz 15 ! 86.67933 173.35867 260.03800 346.71733 433.39667 520.07600 606.75533 693.43467 780.11400 866.79333 953.47267 1040.15200 1126.83133 1213.51067 1300.19000