Which confirms what I always suspected, that manufacturer ratings (particularly of lower-priced bags) are fictional. Exception--a few of the high-end bag manufacturers like Western Mountaineering, Feathered Friends.
The EN13537 ratings aren't foolproof, but at least they are a bit more objective than manufacturer ratings. They also confirm that some of us need warmer bags, as witness the 9-10*F difference between the "comfort" and "lower limit" ratings.
Deciphering the EN13537 ratings.