the number of distinct horizontal lines, alternately black and white, that can be seen in the reproduced image of a television or facsimile test pattern
For the purposes of this Directive, a wide-screen television service must meet the minimum requirements that it uses a transmission system delivering sufficient information to allow a dedicated receiver to display a full frame picture with full vertical resolution and whereas, for the same purposes, a television service using letterbox transmission in 4:3 frame which does not meet the abovementioned minimum criterion should not be considered as a wide-screen television service.
