The description of the exercise and a summary of the results is available in:

Doxani, G.; Vermote, E.; Roger, J.-C.; Gascon, F.; Adriaensen, S.; Frantz, D.; Hagolle, O.; Hollstein, A.; Kirches, G.;Li, F.; Louis, J.; Mangin, A.; Pahlevan, N.; Pflug, B.; Vanhellemont, Q. "Atmospheric Correction Inter-Comparison Exercise." Remote Sens. 2018,10,352. doi:10.3390/rs10020352. 

The following table provides the results about the performance of the various participating AC processors in ACIX. The results are grouped by product (AOT, WV and SR) and refer to all the inter-comparison analysis made per site and processor. Plots and statistical information are presented by sensor and vary based on the data processed by each participant.