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I’d like to download or query Mayall z survey data. 

https://datalab.noirlab.edu/ls/mzls.php

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Hi, thanks for reaching out. You can query Mayall z survey catalogs as part of the Legacy Surveys schema. For instance, ls_dr10.tractor is the main LS table in DR10. Our User Manual showcases how to query the databases:


https://datalab.noirlab.edu/docs/manual/UsingAstroDataLab/ClientInterfaces/QueryClient/QueryClient.html#database-queries

and many of our notebooks go into more detail:

https://github.com/astro-datalab/notebooks-latest
 

Queries would look something like this:

select * from ls_dr10.tractor where mag_z>22.5 limit 100

Let is know if you need more assistance.

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