@DikraK, I think you are not calculating statistics over 25 axes, but rather
really over only one: the axis of the ensemble. The problem is that this
information is not apparent in your current encoding. IMHO, the best way to add
this information would be to combine your current 25 variables into a single
variable with an additional coordinate, i.e.
```
dimensions:
time=UNLIMITED;
ensemble=25;
variables:
float time(time) ;
time:long_name = "time" ;
time:units = "2021-10-07 12:00:00" ;
time:calendar = "gregorian" ;
time:standard_name = "time" ;
time:axis = "T" ;
float pr(ensemble, time, rlon, rlat) ;
pr:grid_mapping_name = "latitude_longitude" ;
pr:coordinates = "lon lat" ;
pr:shortname = "Quantity of precipitation" ;
...
pr:standard_name = "precipitation_amount" ;
```
Then it is easy to see that you can add the percentile information using
something like `cell_methods="ensemble: sum"`.
Note that `sum` in `cell_methods` does not necessary mean "sum", but rather
some form of "sum or accumulation", see [CF Conventions 1.9, Appendix
E](https://urldefense.us/v3/__http://cfconventions.org/Data/cf-conventions/cf-conventions-1.9/cf-conventions.html*appendix-cell-methods__;Iw!!G2kpM7uM-TzIFchu!g2g_f0_WB2tm-MhehHtFacKJ7z2NUrOtKjfPX1sp507JtId2hsCZvlNeVNlmyK-tTeEzOpGSXkc$
).
Allow me also to comment that your use of `rlon` and `rlat` suggests the use of
a rotated grid as is common for example in CORDEX. If this is indeed the case,
you probably don't want to use the `latitude_longitude` grid mapping and might
want to review [CF Conventions 1.9, Section
5.6](https://urldefense.us/v3/__http://cfconventions.org/Data/cf-conventions/cf-conventions-1.9/cf-conventions.html*grid-mappings-and-projections__;Iw!!G2kpM7uM-TzIFchu!g2g_f0_WB2tm-MhehHtFacKJ7z2NUrOtKjfPX1sp507JtId2hsCZvlNeVNlmyK-tTeEzN_fvvXA$
) and Appendix F
[here](https://urldefense.us/v3/__http://cfconventions.org/Data/cf-conventions/cf-conventions-1.9/cf-conventions.html*_latitude_longitude__;Iw!!G2kpM7uM-TzIFchu!g2g_f0_WB2tm-MhehHtFacKJ7z2NUrOtKjfPX1sp507JtId2hsCZvlNeVNlmyK-tTeEzCVc4oNc$
) and
[here](https://urldefense.us/v3/__http://cfconventions.org/Data/cf-conventions/cf-conventions-1.9/cf-conventions.html*_rotated_pole__;Iw!!G2kpM7uM-TzIFchu!g2g_f0_WB2tm-MhehHtFacKJ7z2NUrOtKjfPX1sp507JtId2hsCZvlNeVNlmyK-tTeEzAiFtJ4M$
).
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