Microtops Time O3 Std Dev 6.61 263.7 21.2 6.72 278.7 8.2 7.00 308.1 1.1 8.02 345.7 1.3 9.00 332.4 2.4 10.20 348.0 1.4 11.08 354.9 5.3 11.97 352.4 1.4 13.05 360.5 0.4 14.17 362.3 0.4 14.92 354.0 2.2 Dobson 10 348 12 349 14 352 Sonde integral 13.5 359