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The bar graph image is updated immediately when you update your data. The image filename, however, doesn't change. So if you're not seeing the new data, you're seeing the old, cached image.
If it's strictly in your browser cache, you can reload the page to get the new image. (Different browsers have different "reload" logic - so I'm not sure exactly what you need to do to force images to reload as well as html - you'll have to figure that out.)
There's a small chance the image may be cached upstream by your internet provider as well.
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