idx1    idx2  |  value(s)   ...
------------------------------------------
4       0     |  1.123456   ...
        1     |  2.234567   ...
        2     |  0.012345   ...
8       0     | -1.123456   ...
        1     | -0.973915   ...
        2     |  1.285553   ...
        3     | -0.194625   ...
        4     | -0.144112   ...
...     ...   | ...         ...

ranges = [[(4, 1), (4, 2)],          # range (4,1):(4,2)
          [(8, 0), (8, 3)],          # range (8,0):(8,3)
          [(8, 5), (8, 10)], ...]    # range (8,5):(8,10)