During a discussion of whether the SDF differences counts should be considered as a factor to whether the IFO is in observation mode, Hugh made the observation that the difference count can be changed by the user when switching between the MASK/ALL channel display filter.

For example, if a system has four channels with differences, three of which are monitored and one which is not, then the difference counter is normally 3 (display button defaults to the MASK setting). But if the user presses the ALL setting, the difference count increases to 4. In this example if the monitored channels were made to have zero differences, then pressing the button to ALL would cause the difference count to become non-zero.

Jamie's SDF MEDM alerts the user to this by highlighting the pink indicator if ALL are being displayed. I will follow suit and mark a non-zero SDF-DIFFs as: PINK if ALL chans are displayed, RED if monitored chans are displayed. Note that PINK does not necessarily mean non-monitored channels have differences, just that there is a possibility that this is the case.