Clarification: confusing definition of 'm' in 'geometry' (thetaMode version) #290
Description
openPMD standard version: 1.1.0
When trying to implement the basic version of the standard, I stumbled upon this issue.
A cylindrical axially symmetric dataset (using only the zero mode, and hence having in total one single mode) should have shape (1,:,:), as only the real part of the mode 0 is saved.
In 'geometry', thetaMode version:
...the first axis corresponds to the azimuthal mode. (This last axis has length 2m+1, where m is the number of modes used...
These instructions would lead in the example previously mentioned to datasets with shape (3,:,:), which is incorrect.
Proposed change:
...the first axis corresponds to the azimuthal mode. (This last axis has length 2m+1, where m is the value of the highest mode used...
or
...the first axis corresponds to the azimuthal mode. (This last axis has length m, where m is the number of modes used...