SAWN is softer than the ESI: the normalized internal energy obtained by SAWN is 74% of that obtained in ESI. The magnitude of the difference depends on the capillary temperature and is greater at higher temperature. This suggests that ions are produced from droplets that desolvate faster in ESI than in SAWN, and thus that ions produced by ESI are exposed to heating in the capillary for more extended periods than in SAWN. In SAWN, the droplets are larger; the heating is dissipated in the desolvation process instead of being converted into excess internal energy.