Thank you very much for your quick answer!
This colour spot is exactly what is was looking for in order to achieve a colour coded representation of the data. It seems quite straightforward to use, and will certainly be really helpful.
Concerning the 3D aspect, which would be good to implement at a further stage, the VI that is provided may not be directly applicable to get the result I want (see attached picture of what has been done previously with Matlab), but is a good basis to investigate a way to do it.
Thank you again for your help, do not hesitate to contact me again if you have another idea about the 3D issue...
All the best,
Philippe