Add an HowTo about the colour blind friendly visualisations
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+.. accordion-footer::
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+.. accordion-header::
+ :id: collapseHowToSixteen
+ :title: Colour blind friendly visualisations
+
+The CTA observatory released a document describing best practices for data visualisation in a way friendly to
+color-blind people: `CTAO document <https://www.cta-observatory.org/wp-content/uploads/2020/10/CTA_ColourBlindness_BestPractices2.pdf>`_.
+As the Gammapy visualisations are using the library `matplotlib` that provides color styles, it is possible to adapt the
+colors of the Gammapy plots in order to follow these practices.
+
+To use them, you should add into your notebooks or scripts the following lines after the Gammapy imports:
+
+.. testcode::
+
+ import matplotlib.style as style
+ style.use('tableau-colorblind10')
+
+or
+
+.. testcode::
+
+ import matplotlib.style as style
+ style.use('seaborn-colorblind')
+
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