A parenthetical remark just to clarify since I was reading quickly. Wrt the second point in parentheses about stretch factors - upon a second look it is not cle

A parenthetical remark just to clarify since I was reading quickly. Wrt the second point in parentheses about stretch factors - upon a second look it is not clear to me exactly what is happening since they say the factors are both fixed for each supernova but then also list the (global?) stretch and color factors in Table 1 (implying that they are varied).