Hello Ritchie,
Thank you for the quick reply.
The suggestion almost did what I wanted to achieve: ‘0’ values are no longer displayed on the graph and the autoscale of the ordinates remains in a correct range. However the remaining plots are joined by the curve whereas I would prefer to have a broken line when encountering missing/exclude data ; but it does not matter: this result is also very good.
Topic closed
Thank you !
Regards