{"C1":"C1","C2":"C2","C3":"C3","C4":"C4"}
{"C1":"","C2":"","C3":"","C4":"SD"}
{"C1":"","C2":"Sample","C3":"Mean log","C4":"of log"}
{"C1":"Site","C2":"size","C3":"concentration","C4":"concentration"}
{"C1":"Steam plant","C2":"8","C3":"18","C4":"4.9"}
{"C1":"Clean","C2":"9","C3":"11","C4":"4.6"}