Column names, such as "Df", "Deviance", "Resid. Df", "Resid. Dev", "Pr(>Chi)".
Row names: "NULL", "x1", ... for one fit; "1", "2", ... for a comparison.
One array per row; NaN where R leaves the cell empty (NA).
R's warnings (from the refits and the F test of binomial or poisson families).
Result of glmAnova: R's anova table.