生成gerber文件的各层说明

*.GTL TopLayer 顶层元件面
*.GBL BottomLayer 底层焊接面
*.GTO TopOverlay 元件面字符
*.GBO BottomOverlay 焊接面字符
*.GTS TopSolder 元件面阻焊
*.GBS BottomSolder 焊接面阻焊

*.G1 MidLayer1 中间某层
*.G2 MidLayer2
*.G3 MidLayer3
*.G4 MidLayer4

*.GM1 Mechanical1 机械某层
*.GM2 Mechanical2
*.GM3 Mechanical3
*.GM4 Mechanical4

*.GTP TopPaste
*.GBP BottomPaste
*.GP1 InternalPlane1 内平面1(负片)
*.GP2 InternalPlane2 内平面2(负片)
*.GKO KeepOutLayer 禁止布线层(可做板子外形)
*.GG1 DrillGuide
*.GD1 DrillDrawing
*.GPT Top Pad Master 顶层主焊盘
*.GPB Bottom Pad Master 底层主焊盘
*.GDD 地线层
*.GPW 电源层
*.APT D码表文件
*.A?? 各层的D码表