Ca II NIR and H&K high-velocity features are anti-correlated with their photospheric components and show a positive velocity-difference versus line-ratio correlation, unlike Si II and O I.
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Puzzling High-Velocity Calcium Absorption Features Of Type Ia Supernovae
Ca II NIR and H&K high-velocity features are anti-correlated with their photospheric components and show a positive velocity-difference versus line-ratio correlation, unlike Si II and O I.