SFig18a: neurons (rows) by day intervals (0 to 14 left to right), empty entries not used
SFig18b: neurons (rows) by 15 days (1 to 15 left to right), empty entries not used
SFig18c: feature values of the 16 stimulus directions (0:22.5:337.5 columns) per feature-day combinations(sheets), components1-3 were ordered from top to bottom. 
SFig18d: rows are neurons. 
