Input: Article: Ion gauges are used in ultrahigh vacuum. They come in two types: hot cathode and cold cathode. In the hot cathode version an electrically heated filament produces an electron beam. The electrons travel through the gauge and ionize gas molecules around them. The resulting ions are collected at a negative electrode. The current depends on the number of ions, which depends on the pressure in the gauge. Hot cathode gauges are accurate from 103 torr to 1010 torr. The principle behind cold cathode version is the same, except that electrons are produced in a discharge created by a high voltage electrical discharge. Cold cathode gauges are accurate from 102 torr to 109 torr. Ionization gauge calibration is very sensitive to construction geometry, chemical composition of gases being measured, corrosion and surface deposits. Their calibration can be invalidated by activation at atmospheric pressure or low vacuum. The composition of gases at high vacuums will usually be unpredictable, so a mass spectrometer must be used in conjunction with the ionization gauge for accurate measurement.

Now answer this question: What must be used for accurate measurement on the composition of gases at a high vacuums?

Output: mass spectrometer must be used in conjunction with the ionization gauge

Input: Article: In Bolivia, a 62% majority of residents over the age of 15 self-identify as belonging to an indigenous people, while another 3.7% grew up with an indigenous mother tongue yet do not self-identify as indigenous. Including both of these categories, and children under 15, some 66.4% of Bolivia's population was registered as indigenous in the 2001 Census. The largest indigenous ethnic groups are: Quechua, about 2.5 million people; Aymara, 2.0 million; Chiquitano, 181,000; Guarani, 126,000; and Mojeno, 69,000. Some 124,000 belong to smaller indigenous groups. The Constitution of Bolivia, enacted in 2009, recognizes 36 cultures, each with its own language, as part of a plurinational state. Some groups, including CONAMAQ (the National Council of Ayllus and Markas of Qullasuyu) draw ethnic boundaries within the Quechua- and Aymara-speaking population, resulting in a total of fifty indigenous peoples native to Bolivia.

Now answer this question: In the 2001 census, how much of Bolivia's population was labeled as being indigenous?

Output: 66.4%

Input: Article: The original London production was scheduled to close on Saturday, 7 October 2006, at the Dominion Theatre, but due to public demand, the show ran until May 2014. We Will Rock You has become the longest running musical ever to run at this prime London theatre, overtaking the previous record holder, the Grease musical. Brian May stated in 2008 that they were considering writing a sequel to the musical. The musical toured around the UK in 2009, playing at Manchester Palace Theatre, Sunderland Empire, Birmingham Hippodrome, Bristol Hippodrome, and Edinburgh Playhouse.

Now answer this question: Where was Queen's 2006 London production held?

Output:
Dominion Theatre