24-Apr-11 This section of the archive contains the Gerber files necessary to create a PC board blank for the DIY MSM project. The file extension definitions, in alphabetical order, are as follows. .BOT = Bottom Copper, Layer 4 .GND = Inner ground plane, Layer 2 .PWR = Inner power plane, Layer 3 .SMB = Solder Mask Bottom .SMT = Solder Mask Top .SPT = Solder Paste Top (for RN2) .SST = Silk Screen Top .TOP = Top copper, Layer 1 .nls = Netlist for electrical testing of new boards, IPC-D-356 format. And, of course, the drill files in Excellon extended format. thruhole.npt = For the non-plated mounting holes. thruhole.tap = For all other holes. Happy building.