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Instruments and I always rotated them from one group to the next . I think the areas that we were concerned about and others had other concerns , I think they addressed them in one form or another and I 'd like to thank you . To account for this higher efficiency , NOAA scientists converted the bromine chemical measurements into their equivalent in chlorine and combined them into one number they call “ effective equivalent chlorine ” levels . So he combined them into one folder . Every time I cut down paper and have leftovers , I put them in one of the boxes . The researchers cut four short sections of 203 - millimeter ( 8-inch ) polyvinyl chloride ( PVC ) pipe , closed them on one end , and set them up vertically with the open end beneath the laser .