The command format for sending graphics to the terminals was very simple, and was soon copied by a number of other terminal vendors. These later moved to traditional video terminals using raster scan displays, although these generally offered lower resolution, perhaps half that of the 4010. A number of these also understood the color codes from the Tektronix 4105 raster scan terminal, which added color to the original 4010 command set. This emulation continued to be used and copied by newer terminals to this day; NCSA Telnet and xterm emulates the 4014 (xterm -t).