Multiple co-first authors, co-corresponding authors and co-supervisors

corresponding author  That author of a joint paper who is considered by the publisher to have submitted it for publication  Given that the corresponding author cannot be contacted to confirm if the nature of any figure manipulation merits retraction, would it be appropriate to

Corresponding authors at institutions with Read & Publish agreements can publish Open Access for free How is a corresponding author defined? The corresponding author is the one individual who takes primary responsibility for communication with the journal during the manuscript submission,

For large projects, the corresponding author is usually a senior researcher For smaller projects, the corresponding author may or may not be The corresponding author is the one individual who takes primary responsibility for communication with the journal during the manuscript submission,