datastream, year, month, tod,n, min, max, mean, std
sgpcmbeC1.c1,2003,02 0:30:00,26 ,       0,1.640827,0.103129,0.374084
sgpcmbeC1.c1,2003,02 1:30:00,20 ,       0,       0,       0,       0
sgpcmbeC1.c1,2003,02 2:30:00,20 ,       0,1.729257,0.086463,0.386674
sgpcmbeC1.c1,2003,02 3:30:00,20 ,       0,0.900303,0.045015,0.201314
sgpcmbeC1.c1,2003,02 4:30:00,22 ,       0,       0,       0,       0
sgpcmbeC1.c1,2003,02 5:30:00,24 ,       0,       0,       0,       0
sgpcmbeC1.c1,2003,02 6:30:00,28 ,       0,       0,       0,       0
sgpcmbeC1.c1,2003,02 7:30:00,28 , 2.56511,40.78333,16.78263,10.27958
sgpcmbeC1.c1,2003,02 8:30:00,28 ,6.932949,71.93266,37.99638,18.25355
sgpcmbeC1.c1,2003,02 9:30:00,28 ,4.320973,  122.64,56.46144,31.08815
sgpcmbeC1.c1,2003,0210:30:00,28 ,7.749176, 165.704,56.33502,42.65375
sgpcmbeC1.c1,2003,0211:30:00,28 ,10.54939,208.0792,53.72594,44.94422
sgpcmbeC1.c1,2003,0212:30:00,28 ,4.786121,209.5641,54.31977, 55.8282
sgpcmbeC1.c1,2003,0213:30:00,28 ,7.551623,241.2013,57.12865,56.68223
sgpcmbeC1.c1,2003,0214:30:00,28 ,9.032786,185.9596, 61.6803,52.16069
sgpcmbeC1.c1,2003,0215:30:00,28 ,13.42337,151.5382,58.12773,33.57861
sgpcmbeC1.c1,2003,0216:30:00,28 ,2.972172,112.0445, 48.6037,29.20027
sgpcmbeC1.c1,2003,0217:30:00,28 ,5.368984,83.54084,33.94066,20.36681
sgpcmbeC1.c1,2003,0218:30:00,28 ,       0,8.026762,2.542647,2.480635
sgpcmbeC1.c1,2003,0219:30:00,28 ,       0,1.553286, 0.13502,0.413341
sgpcmbeC1.c1,2003,0220:30:00,26 ,       0,       0,       0,       0
sgpcmbeC1.c1,2003,0221:30:00,23 ,       0,       0,       0,       0
sgpcmbeC1.c1,2003,0222:30:00,21 ,       0,0.931398,0.044352,0.203248
sgpcmbeC1.c1,2003,0223:30:00,22 ,       0,       0,       0,       0