In these cases, the anaesthetist will charge their fee per “basic unit”, but if the operation is one that accrues so many “units” that the “gap” is greater than the “maximum gap”, then the anaesthetist will reduce their fee per “unit” for that operation only, so that the difference between the total fee and the amount the patient will be rebated is equal to the “maximum gap”. In this case the total fee, and hence the “gap”, would be less than if the anaesthetist charged their normal fees.