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Those dashes (which I assume are constantly changing ) are the digital encoded closed captioning data. They are normally out of sight, located in the vertical blanking "bar". It appears that your vertical scan is quite non linear (stretched at the top) to the degree that the vertical sweep has "folded over", placing the CC data into the picture area. Fix the linearity and the CC data dashes will end up where they should... out of sight, above the picture area.
jr
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