Quantum Data 801GC - Manual (Page 110)

4-72 Chapter 4: Built-In Images Model 801GC, 801GF & 801GX¥Rev. X1
TV Vectorscope signature of the TVBar_75 Image
using NTSC color encoding on the 801GX.
TV Vectorscope signature of the TVBar_75 Image
using PAL color encoding on the 801GX.
There are twice as many points as NTSC because the
color sub-carrier phase is reveresed every other scan line.