Fig. 1From: Characterization of the firm–firm public procurement co-bidding network from the State of Ceará (Brazil) municipalitiesPanel a, graphical representation of the process employed to infer the Firm–Firm co-bidding network. Panel b, comparison between the frequency of bidders per tender in the original data set (gray) and in the working data set (red) after filters have been applied. Panel c, comparison between the frequency of bids per firm in the original data set (gray) and in the working data set (red) after filters have been applied. In panels (b) and (c) dashed line represents the OLS regression lines, the domain of the line indicates the domain used for fitting the curveBack to article page