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...olors, grouped by pollutant, the second shows one color, grouped by class. Here's where the problem comes, if I add an additional pollutant, instead defining the data set as follows: dataSet <- data.frame("Pollutant"=c(rep("Black Carbon",5),rep("PM10",5),"Ultrafines"), "Detector"=c(1:5,1:5,10),"Value"=c(seq(50,10,-10),seq(100,60,-10),75),"Class"=c(rep("Mass",10),"Count")) and rerun the same plotting script, I obtain three panels. The one labeled "Black Carbon" correctly displays all three poll...

...ensor and a 4-Gbyte Microdrive card. JVC helped develop MPEG2 compression technology. Making use of its internal technology, the company developed a new MPEG-2 codec chip using a 130-nm process. The 15-mm chip is the smallest codec chip, said Namiki, capable of compressing video at 8.5 Mbps in ultrafine mode. A 4-Gbyte Microdrive can record about 60 minutes in this mode. For normal and economy modes, variable rate coding is used to provide 2 hours of video in normal mode and five hours in economy mode using the 4-Gbyte drive. The codec is the same MPEG-2 device used for DVD to maintain high...