The invention relates to a device for gas filling of a duct in a container of a collapsible type, said duct being defined by a first and a second side wall of the container, the side walls being joined along a common connecting portion, and said duct comprising an inlet arranged in the first side wall. An exemplary system includes a memory that stores radar reflectivity data in a three-dimensional buffer, a display device and a processor that is in data communication with the memory and the display device. A switching element is coupled to one end of the primary winding of the transformer and controls the current of the primary winding of the transformer. The inner panel may be joined to the outer panel at an inner coupling disposed at the first end and joined to the outer panel at an outer coupling disposed at the second end of the inner panel. The halftoned frames or images are then viewed in a sequence in time.