The final selection of the methods and results included will be subject to different criteria including diversity of methods, sophistication of the approach and total number of 'coincident' submissions. Our expectation is, however, that all submissions will be considered. The submission of the data does not change the ownership of the data, the latter remains exclusive to the participating group. Any participants whose results are not included are still welcome to submit their work independently. Participants selected to participate in the joint paper are expected to respond to two rounds of manuscript reviews and to remove inconsistencies and gaps. Failure to reply within a two-week period effectively confirming co-authoring could result in exclusion from the joint publication. The publication should be viewed as the starting point for numerous follow-up activities by the individual groups, such as completing or improving their predictions in a non-blind fashion. Groups which did not meet the submission deadline are invited to present their results independently as well. Some experimental assignments may have to be revisited in the light of systematically conflicting predictions. Optional data provided by the computational approaches may help to better understand the spectra. The double-sided theory-experiment interplay will continue, as usual in the field. All these activities profit from a fast publication of the primary blind challenge results.