set view equal xyz
  set ticslevel 0
  set colors classic

  set xlabel 'x'
  set ylabel 'y'
  set zlabel 'z'
  set border 1+2+4+8 + 16+32+64+128 + 256+512+1024+2048

  splot 'grid.txt' u 2:3:4 w d

  pause -1 'Press Enter to continue: '