Protel Gerber Layer Names

GTO - Gerber Top Overlay (silkscreen)

GBO - Gerber Bottom Overlay (silkscreen)

GTL - Gerber Top Signal

GBL - Gerber Bottom Signal

GTS - Gerber Top Solder Mask

GBS - Gerber Bottom Solder Mask

GTP - Gerber Top Paste Mask

GBP - Gerber Bottom Paste Mask

GM1 - Gerber Mechanical 1

GM2 - Gerber Mechanical 2

GM3 - Gerber Mechanical 3

GM4 - Gerber Mechanical 4

GDD - Gerber Drill Drawing

GD1 - Gerber Drill Drawing, Top To Mid 1

GD2 - Gerber Drill Drawing, Mid 1 To Mid 2

GDG - Gerber Drill Guide

GG1 - Gerber Drill Guide, Top To Mid 1

GG2 - Gerber Drill Guide, Mid 1 To Mid 2

GPT - Gerber Top Pad Master

GPB - Gerber Bottom Pad Master

GKO - Gerber Keepout

PO1 - Gerber Panels

REP - Report file

TXT - ASCII NC Drill

DRL - EIA NC Drill

DRR - NC Drill Report

APR - Aperature File