SFig20a: ACG time points (columns) by 15 days (day1 to 15, up to down)
SFig20a-Bottom: rows are unit pairs.
SFig20cd: neuron IDs (rows) by days (1 to 15 left to right), each non-empty element represents a day that the neuron was tracked.
SFig20e: each row is one shank. 
