Supplemental online material (Leo). Supplemental material can be a video, dataset, fileset, sound file, or anything else which supports (and is pertinent to) your paper. Supplemental material must be submitted for review upon paper submission.  Additional text sections are normally not considered supplemental material.  We publish supplemental material online via Figshare.
Cover letter (Leo)
manuscript must be accompanied by a statement that it has not been published elsewhere and that it has not been submitted simultaneously for publication elsewhere.
data releases + code releases