Hi Becky,
No, these data are not published but I can provide our data, just send me an email. I am aware that people always look for these comparison between skin mark and surface guidance to get a justification. But once again, for me this is not the one and only justification. Surface guidance will give you more than maybe better initial positioning accuracy. Your patients will appreciate a lot if they are not bothered by skin marks/tattoos anymore! Your RTTs will be happy if they don’t have to apply these marks and take care of them during treatment. This will safe time! And you will be able to check proper position during treatment.
Daniel