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If PAL-Delay were working with progressive scan then V chroma res would be halved, but with interlace it becomes way more disastrous: The summed interlace pairs have double the separation. This, and its diminished "Kell factor" would take V chroma res down to <80 'lines'. Same for H chroma res with motion - maybe down to ~50 lines.
NTSC-M could achieve ~ 100 x 350 'lines' chroma
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