JPEG75 vs. 1"#

DC estimation: 18.88 (average)

Only a few data points within the datasets:

 18.44 18.32 18.34 20.4 

JPEG75 vs. 2"#

DC estimation: n/a

JPEG75 vs. 40"#

DC estimation: 6.2 (orange dash line)

JPEG75 vs. 266"#

DC estimation: 7.52 (orange dash line)