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[i]The vacuum we're maintaining inside the sphere varies. At the very beginning of life, when we first pump it down, it's at about 10^-7 millibars, so that's like less than a billionth of the pressure of the Earth's atmosphere. From just normal kind of out-gassing of materials inside the sphere, we expect it to raise up a little bit, maybe a thousandth of a millibar and we can operate our seismometers at about a tenth of a millibar, which is again, about a thousandth of the pressure of the Earth's atmosphere. The leak rate that we were seeing was bringing it up from essentially zero to about two-tenths of a millibar over the course of a few days. So even today, we still have less than a ten-thousandth atmosphere of pressure in there, which is by most standards, a pretty darn good vacuum, but for our purposes we need a better vacuum than that.[/i]
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