Problem with double chart

hello,
I happen to be looking at 2 very similar graphs, which have power-cadence and heartrate-cadence data in common.
When I try to visualize both on power screen I see this error

Thanks

The scripts for those custom plots needs to be in a block. All the scripts run in the same sandbox for the activity for performance reasons. So instead of:

let cadence = ...

Do:

{
  let cadence = ...
}

At the top level of the script.

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