Map of R-Mode initiation places
Map of all potential doors at which R-Mode or God-Mode setups are theoretically possible (in the original Super Metroid): (unfinished)
The yellow boxes next to doors mean that when entering the room in which this box is from the corresponding door on the other side, it is theoretically possible to obtain R(eserve)-Mode in the room in which the yellow box is, at the place where this box is. The meaning of the red boxes is analogous, just for God-Mode and not just R-Mode. At the places with the yellow dotted boxes, I am not sure if it is possible to set up R-Mode there (in PAL and/or NTSC).