Observers asking for a SW flash mode should not forget to select the following operations: Ob (observation) and Dk (Dark). Note that the logic used by ISOCAM will not execute these procedures automatically and will not force the observer to apply the correct sequence of operations: Ob and Dk. The duration of the observation is 28 minutes, not 20 as stated in the manual. PGA also asks for the dark procedure number and for the number of stabilisation exposures. Though one cannot leave these fields empty, however the values are irrelevant for the flash-mode.