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I would like to make a box with a colour gradient (discrete or continuous) as shown in the picture below with ggplot2 in R. The colour in the box shows how close points are fitted, i.e. values are given in a simple vector. The box should appear right below my plot.
Can anybody give a hint how such a box can be built?
enter image description here

N8_Coder
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    have a look at [this question here](https://stackoverflow.com/questions/50506832/create-discrete-color-bar-with-varying-interval-widths-and-no-spacing-between-le/50518287#50518287) It might contain what you want. Basically, it is about using `geom_rect` – tjebo Aug 08 '18 at 07:36
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    This can be useful too https://github.com/tidyverse/ggplot2/issues/2673#issuecomment-402878574 – Tung Aug 09 '18 at 01:41

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