Fig. 2.
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Velocity (left), pEW (middle), and FWHM (right) of Si IIλ5972 (blue diamonds) and Si IIλ6355 (black circles) from the ZTF DR2 SN Ia sample as a function of rest-frame phases with respect to SALT2 maximum light. The black and blue dashed lines in the right panel represent the linear regression fits to the FWHM of Si IIλ6355 and Si IIλ5972, respectively.
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