"L" streaming format?

While browsing the excellent sounding Daniel Barenboim catalog in Mosaic/Tidal, I am seeing “L” streaming format. What does it mean?

When the source has artwork and additional information available the interface will show it. This is a list of albums. Note that along with artwork and metadata Mosaic Control is also showing information about the format of the album.

image Indicates lossless resolution greater than CD

image Indicates a an album in MQA format (TIDAL only)

image Indicates lossless resolution of 16 bit 44.1 kHz

image Indicates lossy compression (AAC and MP3)

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I see now, thank you Angus