# annotate_heatmap¶

gammapy.visualization.annotate_heatmap(im, data=None, valfmt='{x:.2f}', textcolors=['black', 'white'], threshold=None, **textkw)[source]

A function to annotate a heatmap.

Parameters
im

The AxesImage to be labeled.

data

Data used to annotate. If None, the image’s data is used. Optional.

valfmt

The format of the annotations inside the heatmap. This should either use the string format method, e.g. “\$ {x:.2f}”, or be a matplotlib.ticker.Formatter. Optional.

textcolors

A list or array of two color specifications. The first is used for values below a threshold, the second for those above. Optional.

threshold

Value in data units according to which the colors from textcolors are applied. If None (the default) uses the middle of the colormap as separation. Optional.

**kwargs

All other arguments are forwarded to each call to text used to create the text labels.