Multiple temperature sensors in one

Configuration
2

I took a stab in the dark at this a couple of weeks ago

history_graph:
  gr1:
    name: Temperatures
    hours_to_show: 24
    entities:
      - sensor.house_temp
      - sensor.dark_sky_apparent_temperature

I think that all entities have to be of the same type, and you can obviously set the duration to show.

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