In a method to create a gain-corrected x-ray image with the aid of a flat-panel x-ray detector a number of gain images are determined on calibration and this is done for different measurement situations which correspond to different settings of specific x-ray imaging variables such as the angle of the flat-panel x-ray detector to an x-ray tube, the energy of the x-radiation used etc. The new responsiveness of these genes allows for their use in regulated gene expression in Bacillus sp. The method includes positioning a specially designed lift or hoist unit within a rear compartment of a parcel delivery truck. A controller receives information from the photoimager and adjusts the positions of the movable mirrors according to light received at the photoimager. The user is enabled to electronically work with the selected floor plan to produce a modified floor plan, and save an instance of the modified floor plan at the floor plan server so that the user can revisit and work with the saved instance.