We have run 40 " slot time-series data. Once we run the eis_prep with /noabs keyword then we get the Intensity in 'DN' units. While, when we run the same with absolute calibaration (without /noabs keyword), we get the intensity in absolute cgs unit.However, this is surprising that when we are plotting intensities with time, we are getting the different patterns of variations in the above mentioned two cases. This is affecting our further analysis and also confuses which one we have to choose. Either DNs one or absolute one ?? !!!! Why they are giving different pattern?. There should only be the difference in magnitude. why the pattern is also varying. Which one we have to choose for our further analysis ? Is it here any problem with absolute calibaration of EIS ? Please suggest !