Dear LWS observer, The last LWS observing mode has now been released for observations. The Fabry Perot wavelength range AOT (L03) has been tested using observations of the Galactic Centre, and was found to be working properly. Therefore other observations using the L03 AOT can now also be scheduled. We would like to ask all L03 observers to carefully read the advice on the use of L03 as given in a note that was sent out by the ISO helpdesk on March 11, 1997, and which can also be found on the World Wide Web at the corresponding page. In short L03 should only be used to identify lines and determine reasonably accurate (20%) line fluxes for sources with smooth continuum and narrow lines (less than 5 FP resolution elements). In all other cases L03 might be used, if no other observing mode is possible. However, there will be great difficulty in the interpretation of the data in those cases. If a measurement of the continuum is also needed for the scientific goals of the proposal, a full grating scan should be made using the L01 AOT. Please contact the ISO helpdesk for any changes necessary to your observations, or to release the programme as is. Best regards, ISO helpdesk.