Examples of three distinct families of glitch transfer functions for a typical PSB-a bolometer. Events like the blue curves are called “short” events, those like the black curves are called “long”, and those like the red curves are called “slow”. Typical variation of the shape within each family is shown for short and long glitches. The differences between long glitch shapes are modelled by a single nonlinearity parameter relating the amplitude of the slow tail of events with their peak amplitude. There is no apparent glitch tail associated with short events.