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Norton , A.A., Pietarila Graham, J.D., Ulrich, R.K., Schou, J. , Tomczyk, S., Liu, Y. , Lites, B.W., Ariste, A. Lopez, Bush , R.I., Socas-Navarro, H. , and Scherrer, P.H. (2006) Spectral line selection for HMI. In: Proceedings of Astronomical Society of the Pacific Conference Series (358) pp. 193-196. From: Astronomical Society of the Pacific Conference Series, 19-23 September 2006, Colorado, USA.