This dataset consists of a single ASCII formatted file containing the electron densities derived from the multi-Needle Langmuir Probe (m-NLP) measurements on board the ICI-2 rocket. More information about how the densities were calculated can be found in the refereced article. The first column contains the time after launch in units of s, the second column contains the plasma density in m^{-3}. It should be noted that the data was filtered with a notch filter in order to remove the rocket spin frequency and its first 3 harmonics.