> For the complete documentation index, see [llms.txt](https://docs.finngen.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.finngen.fi/working-in-the-sandbox/which-tools-are-available/atlas/detailed-guide/atlas-data-sources.md).
# Data Release Summary Statistics in Atlas
The Atlas **Data Sources** option allows you to create **FinnGen data release-level descriptive summary statistics.**
### **Example: Drug exposure** statistics
* Choose the **Data Sources** option from the left menu
* Select the FinnGen data release from the first drop-down menu (we have selected the FinnGen data release 9 below)
* Select **Drug Exposure** from the second drop-down menu
#### Treemap display
By default, the summary statistics are shown using a Treemap.
In our example:
* the boxes represent different drugs
* the box size shows the prevalence of the drug
* the box color shows the number of records per person (a darker color means more records)
Hovering the mouse above a box gives details about the drug it represents.
#### Table display
* To see the information in a table format click the **Table** tab
The table will show the drug names, ingredients, person counts, prevalence, and records per person:
* You can use the **Filter** field to search the drugs by name
### Atlas tutorials
* [Data sources: Drug Exposure](https://www.youtube.com/watch?v=u5zOHIt-tvQ)
* [Data Sources: Data Density](https://www.youtube.com/watch?v=8amxu-5hUoY)
### Atlas documentation
* [The Book of OHDSI, Chapter 11.6 Database Characterization in ATLAS](https://ohdsi.github.io/TheBookOfOhdsi/Characterization.html#database-characterization-in-atlas)