Observation test instance - Multiple compounding axes A Landsat TM spectrum is observed on 4 stations at 5 time instants Spectrum Series 2005-06-17 2005-06-21 9 8 7 6 5 4 3 1 2 3 4 5 6 7 1 9 2 8 3 7 4 5 6 3 7 2 8 1 9 8 7 6 5 4 3 1 2 3 4 5 6 7 1 9 2 8 3 7 4 5 6 3 7 2 8 1 9 8 7 6 5 4 3 1 2 3 4 5 6 7 1 9 2 8 3 7 4 5 6 3 7 2 8 1