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It shows daily weight measurements, with a trend line fitted using a polynomial regression.
The dotted orange lines show upper & lower 95% confidence bounds for the current week (where I can reasonably expect my weight to fall in the next week or so, all things remaining equal), and the dotted blue lines show where that range was last week.
It can be useful for spotting when my weight loss is slowing down:
what is this graph, it's better than mine