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Figure 1: The UBVR template light curves obtained after the training phase for different values of the stretch and null color. Note the strong variations of the U-band maximum with the stretch. Note also the after max shoulders in the V and R bands. The model also reproduces well the fact that the brighter-slower relation is weaker in the R band than in the B or V bands. The model does not incorporate the brighter-slower correlation. The apparent brighter-slower correlation for the U band is, in fact, a stretch-color correlation. |
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Figure 2:
Residuals to the light curve fit as a function of phase, for supernovae from the training sample (open symbols) and the test sample (filled symbols).
There is no significant difference between the distributions obtained with both samples which proves that the model is not over-trained.
The systematic residuals as a function of phase are a direct consequence of the limited number of parameters (5) used to implement the corrections
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Figure 3:
The color correction
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Figure 4: From top to bottom: residuals to the Hubble diagram as a function of redshift, stretch s and color c indexes for supernovae of the test sample fitted in B and V bands. SNe with redshifts smaller than 0.015 are labeled with opened symbols. |
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Figure 5:
68% joint confidence regions for
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Figure 6:
From top to bottom: residuals to the Hubble diagram as a function
of redshift, stretch s and color c indexes for supernovae of the test sample
fitted in U and B bands. The values of
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Figure 7: Differences of s and c values fitted with either UB or BV light curves of supernovae from the training and the test sample (respectively opened and filled symbols). The error bars only reflect the propagation of photometric errors and do not account for any intrinsicdispersion. |
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