Apologies if this has already been answered, but I couldn’t find clear documentation whether the data on Sentinel AWS after 2022 change of processing baseline to 4.0 is harmonized or not? In other words, should I always subtract 1000 for all the band values to be consistent with prior baselines? The SentinelHub API seems to support harmonizeValues flag, but I want to make sure that the raw data I download from the S3 bucket has not been harmonized and this post-processing is necessary for both L1C and L2A.

The reason I am unsure is because some of the L2A band values for B02 seem to be between 0-1000 (e.g., s3://sentinel-s2-l2a/tiles/28/Q/ED/2022/10/26/0/R10m/B02.jp2). By removing 1000, the numbers become negative which seems incorrect.