For the 737 I could not find the environmental envelope chart in any of the FCOMs I caught online. Somebody above said it's inside the AFM.
The graph I posted is from Continental Airlines 772 FCOM, 2002 edition. Probably heavily tailored.
https://curiozitydotnet.files.wordpr...ght-manual.pdf
The 747 FCOM found is ZK-SUI from ILFC and content-wise looks identical with the 737 in the Limitations Chapter. No Environmental Envelope Graph.