Table 5: Comparison of SNe Ia spectral features in different host types at low and high-z. The values given are the mean and error in the mean of the residuals from the low-z trend.
Feature SNe Measurement (low-z trend subtracted)

E/S0 Spiral

Low-z

EW{CaII} - Å $-1.7\pm 4.7$ $-2.0\pm 3.2$

EW{SiII} - Å $5.1\pm 0.7$ $-4.5\pm 0.9$

EW{MgII} - Å $-0.6\pm 3.8$ $-0.7\pm 2.9$

$v_{\rm {ej}}$ - 1000 km s^-1 $-0.18\pm 0.23$ $0.17\pm 0.27$

High-z

EW{CaII} - Å $-13.0\pm 16.0$ $-0.8\pm 7.2$

EW{SiII} - Å $5.0\pm 2.4$ $-1.4\pm 1.1$

EW{MgII} - Å $29.1\pm 9.5$ $0.1\pm 7.7$

$v_{\rm {ej}}$ - 1000 km s^-1 $-0.13\pm 0.90$ $0.55\pm 0.50$

**Table 5:** Comparison of SNe Ia spectral features in different host types at low and high-z. The values given are the mean and error in the mean of the residuals from the low-z trend.
Feature	SNe Measurement (low-z trend subtracted)
	E/S0	Spiral
Low-z
EW{CaII} - Å	$-1.7\pm 4.7$	$-2.0\pm 3.2$
EW{SiII} - Å	$5.1\pm 0.7$	$-4.5\pm 0.9$
EW{MgII} - Å	$-0.6\pm 3.8$	$-0.7\pm 2.9$
$v_{\rm {ej}}$ - 1000 km s^-1	$-0.18\pm 0.23$	$0.17\pm 0.27$
High-z
EW{CaII} - Å	$-13.0\pm 16.0$	$-0.8\pm 7.2$
EW{SiII} - Å	$5.0\pm 2.4$	$-1.4\pm 1.1$
EW{MgII} - Å	$29.1\pm 9.5$	$0.1\pm 7.7$
$v_{\rm {ej}}$ - 1000 km s^-1	$-0.13\pm 0.90$	$0.55\pm 0.50$

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