**Table 2:** Relative improvement in confidence level contours in the $(\Omega _{\rm M},w)$ -plane from corrections for gravitational lensing. The results presented in this table were obtained using a Fisher matrix analysis for an SNLS-like data set consisting of 250 high redshift SNe Ia and 44 low redshift SNe Ia (assumed not to be affected by lensing).
$\sigma_{\rm int}$	$\sigma _{\rm err}$	Scenario 1^a	Scenario 2^b	Scenario 3^c
(mag)	(mag)	$A_{\rm corr}/A_{\rm lensed}$	$A_{\rm corr}/A_{\rm lensed}$	$A_{\rm corr}/A_{\rm lensed}$
0.13	Eq. (4)	0.95	0.95	0.96
0.09	Eq. (4)	0.92	0.93	0.93
0.09	0	0.84	0.87	0.87
0.05	0	0.69	0.74	0.74

^a No shift in halo mass.
^b All halo masses are underestimated by 50%.
^c All halo masses are overestimated by 50%.

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