Percentage New Research Collaborations by Disciplinary Intersection. The colour of each pixel represents the level of new researcher-researcher co-authorship pairings seen on COVID-19 papers compared with pre-COVID. Each researcher in the pairing has a principal research categorisation and the combination of these two determines the relevant pixel. The intensity of the colour in the pixel corresponds to the proportion of new collaborations to existing collaborations in the relevant subject pairing. There is a 10 researcher cut-off for each pixel to prevent flagging low volume collaboration signals clouding the picture.