This question came up during the Tips and Tricks webinar on 6 December, but I didn't have the answer. Anybody know?
Webinar slides: https://developer.arm.com/-/media/Files/downloads/hpc/files/Webinars/ArmJonLinford_TipsTricksWebinar.pdf?revision=5b701e6c-2bee-4f4c-a650-88a60f6ef730&la=en