Rad2Refl after Rayleigh correction

[marpet]

Probably this post can help you:

Split product bandwise into single GeoTiff files

I would like to share an example graph file which shows how to split a product into separate GeoTIFF files. Each GeoTIFF file will contain only one band. How this can be achieved is shown by the example of a Sentinel-2 product, but the approach can be adapted to other products. The example reads a Sentinel-2 L1C product, resamples it to a common resolution and then splits and writes each specified band. Only the bands B1 and B2 are considered in the graph. But it can easily be extended to the…

To get the names you should do the processing once and write the product. Then you can open it in SNAP and inspect the result. Or you do the processing directly in SNAP. The bands you are looking for are named “rBRR_##”
As source product you can specify the name of the node which shall provide the input.
This is also shown in the thread above.