datastream, year, month, tod,n, min, max, mean, std
sgpcmbeC1.c1,2005,07 0:30:00,31 ,       0,1.593374,0.124038,0.397969
sgpcmbeC1.c1,2005,07 1:30:00,31 ,       0,1.280395,0.094319,0.301131
sgpcmbeC1.c1,2005,07 2:30:00,31 ,       0,0.944187,0.086937,0.270198
sgpcmbeC1.c1,2005,07 3:30:00,31 ,       0,       0,       0,       0
sgpcmbeC1.c1,2005,07 4:30:00,31 ,       0,       0,       0,       0
sgpcmbeC1.c1,2005,07 5:30:00,31 ,       0,22.16453, 13.1011,4.906859
sgpcmbeC1.c1,2005,07 6:30:00,31 ,8.835715,79.26626,45.52751,17.21775
sgpcmbeC1.c1,2005,07 7:30:00,31 ,9.636298,111.2545,60.19796,17.94086
sgpcmbeC1.c1,2005,07 8:30:00,31 ,21.16922,171.4874,73.60001,35.68572
sgpcmbeC1.c1,2005,07 9:30:00,31 ,41.02371,262.0824,70.57617,48.26925
sgpcmbeC1.c1,2005,0710:30:00,31 ,29.67962,247.3301,75.72742,64.32208
sgpcmbeC1.c1,2005,0711:30:00,31 ,17.27125,308.9375,87.82122,81.31776
sgpcmbeC1.c1,2005,0712:30:00,31 ,3.545484,358.2528,124.0721,105.7182
sgpcmbeC1.c1,2005,0713:30:00,31 , 14.2883, 399.556,142.2617, 123.544
sgpcmbeC1.c1,2005,0714:30:00,31 , 24.2523,379.2397,127.6692,113.3976
sgpcmbeC1.c1,2005,0715:30:00,31 , 26.8448,338.4091,122.2019,90.41716
sgpcmbeC1.c1,2005,0716:30:00,31 ,13.43479,207.5096,78.72471,47.50257
sgpcmbeC1.c1,2005,0717:30:00,31 ,9.674016,185.0159,69.50683,30.62737
sgpcmbeC1.c1,2005,0718:30:00,31 ,5.226396,81.14462,  48.012,17.83338
sgpcmbeC1.c1,2005,0719:30:00,31 ,2.260804,44.21896,24.19872,  9.4898
sgpcmbeC1.c1,2005,0720:30:00,31 ,       0,2.834031,0.211817,0.576854
sgpcmbeC1.c1,2005,0721:30:00,31 ,       0, 1.07983,0.095059,0.296027
sgpcmbeC1.c1,2005,0722:30:00,31 ,       0, 0.93311,0.068987, 0.22663
sgpcmbeC1.c1,2005,0723:30:00,31 ,       0,1.459426,0.142356,0.383991