Binding energy fits of the TPDs (left column) and the corresponding binding energy distribution histograms (right column) of three separate, subsequent depositions of 1 ML of NH₃ on the surface of CI. Each deposition is followed by a TPD to remove the ammonia deposited on the ice substrate before the subsequent deposition was made. The preference of ammonia to bind to water instead of itself can be seen through the progressive increase in peak height (indicated by the red arrow) with each trial.