Based on observations obtained at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. Based also on data collected at ESO/VLT during observation program 68-C.0171.

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See the FORS user manual at http://www.eso.org. The polarisation level, P, is obtained by calculating $P=\sqrt{Q^2+U^2}/I$ and the position angle, $\Theta$ , by calculating $\Theta = 1/2\arctan~(U/Q)$ .

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... Threads

http://cxc.harvard.edu/ciao/threads/

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... (EMD

EMD defines the the emission measure $EM=n_{\rm e}n_{\rm H}V$ as a function of the temperature, where $n_{\rm e},n_{\rm H}$ are electron and hydrogen densities, respectively, and V is the volume.

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