In the early phase of the XMM mission correct ODFs were not available. To be able to analyse EPIC-pn flight data obtained during the commissioning phase a couple of temporary parameters were introduced to mimic the interface to the housekeeping files (PMH, PAH) needed in epframes (see the corresponding task description for more details). All these parameters are not relevant for data from the Guest Observer programme. To reduce the number of warnings due to missing files and columns use the setting “odfok=N hkok=N".
