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Primary Actor: Crewmember.
Stakeholders & Interests: 

Brief Description: A crewmember wants to view the data from the sensors in a graph, to do this they place their desired graph in their tab.

Preconditions: A crewmember has logged in to the web application and has at least one tab.
Postconditions: The crewmember can see the newly placed graphs.
Main success scenario (basic flow): 
Actor ActionSystem Responsibility

1. The crewmember adds a new graph to his tabheads to the list of all available sensors that have graphs.


3. The crewmember selects the desired sensor to add a graph fromfor.


5. The crewmember selects the desired type of graph to add to the tab.


2. System shows all sensors to choose a graph from.


4. System shows all graphs that are included in the current selection.


6. System adds the graph to the tab.

Extensions (alternative flow):

2a. There are no sensors available in the database.
      end of usecase.

4a. There are no graphs available that are linked with the shown sensors.
      end of usecase.

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