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We are making a correction to the 2006 Supplement, Section 43-9. The MARC 1 W-4 Module calculation results shown in the first paragraph on page 158 are changed as follows: V22 = 30.57 ft/sec (20.8 mph)= delta-V2, V11 = 27.57 ft/sec(18.8 mph),delta-V1 = - 21.81 ft/sec(-14.87 mph).