AVR: storing a 2d array in PROGMEM

I've just been fangling with a UV Painter project (row of LEDs to 'paint' on a glow-in-the-dark-wall). I quickly ran out of RAM when adding patterns to the system and learned how to add variables to the Flash program memory instead. Pretty simple and very useful:

#include <avr/pgmspace.h>

const uint8_t mCylonScan[10][N_LED] PROGMEM = {
  {255,0,0,0,0,0},
  {0,255,0,0,0,0},
  {0,0,255,0,0,0},
  {0,0,0,255,0,0},
  {0,0,0,0,255,0},
  {0,0,0,0,0,255},
  {0,0,0,0,255,0},
  {0,0,0,255,0,0},
  {0,0,255,0,0,0},
  {0,255,0,0,0,0}
};

Then to access the data you just do the following (where 'i' and 'j' are loop variables):

data = pgm_read_byte(&(mCylonScan[i][j]));

See the AVR libc docs for more details.