Fig. 2.
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Comparison of linear polarisation of the Ca II H and K lines computed with the multiterm (MT, solid curves) and multilevel (ML, dashed curves) formalisms for different values of the heliocentric angle μ for the case of zero magnetic field. The colours represent the different values of μ as given in the legend. For μ = 1 no scattering polarisation is produced and both curves are identically zero.
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