Reply to reviewers comments

All comments accepted and the corresponding corrections made, with the exception of:

Point19. At the time of writing, the external services are not well enough defined to make a clear statement on this. The main challenge to this technology has been technical feasability and safety.
Point20. At the time of original submission (and of the presentation of results) a full simulation allowing the measurement of performance criteria was not available for the strip detector option. Efficiency numbers were thus not available.