datastream, year, month, tod,n, min, max, mean, std
sgpcmbeC1.c1,2007,07 0:30:00,31 ,       0,0.337499,0.020258,0.074093
sgpcmbeC1.c1,2007,07 1:30:00,31 ,       0,0.068261,0.002202, 0.01226
sgpcmbeC1.c1,2007,07 2:30:00,31 ,       0,0.045989,0.001484, 0.00826
sgpcmbeC1.c1,2007,07 3:30:00,31 ,       0,       0,       0,       0
sgpcmbeC1.c1,2007,07 4:30:00,31 ,       0,       0,       0,       0
sgpcmbeC1.c1,2007,07 5:30:00,31 ,       0,7.595044,3.111136,2.219596
sgpcmbeC1.c1,2007,07 6:30:00,31 ,       0,18.26085,8.990211,5.094766
sgpcmbeC1.c1,2007,07 7:30:00,31 ,1.665582, 31.5183, 11.3581,7.766314
sgpcmbeC1.c1,2007,07 8:30:00,31 ,2.589055,60.75622,18.11026,14.27549
sgpcmbeC1.c1,2007,07 9:30:00,31 ,6.513278,  42.464,17.84277,11.15288
sgpcmbeC1.c1,2007,0710:30:00,31 ,3.515693, 66.4915,25.68461,20.07518
sgpcmbeC1.c1,2007,0711:30:00,31 ,2.321274,84.29692,39.88296,20.83612
sgpcmbeC1.c1,2007,0712:30:00,31 ,1.206906,88.71516,42.46118,21.89548
sgpcmbeC1.c1,2007,0713:30:00,31 ,1.017242,73.95684,35.45751,20.45088
sgpcmbeC1.c1,2007,0714:30:00,30 ,5.857821,79.10641,33.95377, 19.4685
sgpcmbeC1.c1,2007,0715:30:00,31 , 3.74058,68.72576,29.60061, 18.4666
sgpcmbeC1.c1,2007,0716:30:00,31 ,1.636455,59.17892,24.05235,14.50741
sgpcmbeC1.c1,2007,0717:30:00,31 ,3.906609,41.38697,16.75012, 8.33501
sgpcmbeC1.c1,2007,0718:30:00,31 ,3.421576, 21.4481, 12.7142,4.275934
sgpcmbeC1.c1,2007,0719:30:00,31 ,0.521999,10.47191,5.512068,2.922179
sgpcmbeC1.c1,2007,0720:30:00,31 ,       0,0.071207,0.002297,0.012789
sgpcmbeC1.c1,2007,0721:30:00,31 ,       0,       0,       0,       0
sgpcmbeC1.c1,2007,0722:30:00,31 ,       0, 0.15574,0.005053,0.027967
sgpcmbeC1.c1,2007,0723:30:00,31 ,       0,       0,       0,       0