Answered
How can I access all the data area of and RW2 file
During the last tour of Cornwall I set the camera to 16:9 format which I now regret. I assumed that having downloaded in RAW that I would have all the data from the whole sensor. Certainly the file size is the same whether I set 16:9 or 4:3, 22.95 MB. However the number of pixels for 16:9 is 5184 x 2920 and the number of pixels for 4:3 is 5184 x 3888. But I cannot find anywhere in Lightroom to change the format without losing pixels by cropping.
Am I right in thinking that I have all the data in the RAW file (.RW2)?
Is there any way you know that I can access the 4:3 format for the photos I shot in 16:9 without cropping and losing more pixels?

