1 back back gbr Back (solder-side) copper
2 backmask backmask gbr Back (solder-side) solder resist
3 fab fab gbr Fabrication diagram
4 front frnt gbr Front (component-side) copper
5 frontmask frntmask gbr Front (component-side) solder resist
6 frontsilk frntsilk gbr Front (component-side) silk screen
7 plated-drill drill cnc NC drill (plated; finished sizes specified)