snr = 1 db
snr = 1, 2, 3 db
snr = [1 0 0]
      [0 2 0]
      [0 0 3] db
element 0:
  stuff := 1 db
element 1:
  stuff := 1, 2, 3 db
element 2:
  stuff := [1 0 0]
           [0 2 0]
           [0 0 3] db
