I am trying to calibrate my NTSC monitor and have discovered a wide range of values in recommended color bar images. Specifically the "Pluge" is all over the place. The dark grey rectangle, that is generated in VV4, shows RGB values of 41-41-41; however, it is my understanding that SMPTE NTSC bars have this value at 24-24-24. I have seen a variety of web pages offering their own "standard" bars with this grey at 10-10-10 or 12-12-12 - and other values.