sentences:  Carbon dioxide concentration during MIS 11 was possibly similar to that documented in the pre-industrial period, but not especially high when compared to other interglacial periods (for example, concentration was probably higher during MIS 9).In addition, a peculiar feature of MIS 11 is that an early peak, usually associated to the deglaciation in response to increasing temperatures, is not detected.Seemingly, the long-lasting interglacial conditions that are documented during MIS 11 depend on the peculiar interplay between concentration and insolation.