Changes to stamp 153813

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March 31, 2019, 1:27 am UTC . . Stan Shebs . . update - cv -> a
October 15, 2017, 1:21 pm UTC . . Stan Shebs . . update - ndenom2 0 -> 6, dt 30 -> landmarks (1932)
August 1, 2011, 1:23 pm UTC . . Stan Shebs . . insert - was dt=30