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Update solution_architecture.md 

Co-authored-by: Jeremias Rößler <jeremias.roessler@sap.com>
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@ -272,7 +272,7 @@ If the back end calls from the mobile applications cannot be spread as evenly as
A definite prerequisite for compatibility is that the identifiers of the mobile devices can be matched, i.e. the GAEN framework by Apple and Google is being used.
[Most European countries are developing similar contact tracing apps](https://ec.europa.eu/info/live-work-travel-eu/health/coronavirus-response/travel-during-coronavirus-pandemic/mobile-contact-tracing-apps-eu-member-states_en). These apps may use the common frameworks by Google and Apple, enabling transmission and detection of GAEN format diagnosis keys between devices running different contact tracing applications.
Each country has its own separate database which contains the keys from infected individuals. In order to coordinate exposure information between countries, a common service is required to enable interoperability.
Each country has its own separate database, which contains the keys from infected individuals. In order to coordinate exposure information between countries, a common service is required to enable interoperability.
The [European Federation Gateway Service (EFGS)](https://github.com/eu-federation-gateway-service/efgs-federation-gateway) enables interoperability of diagnosis keys between the connected country backend servers.
![Figure 15: High-level EFGS overview](images/solution_architecture/EFGS_overview.jpg "Figure 15: High-level EFGS overview")