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zoo object won't plot

DateTime	RM61
11/30/2006 12:31	NA
11/30/2006 12:46	NA
11/30/2006 13:01	2646784125
11/30/2006 13:16	NA
11/30/2006 13:31	NA
11/30/2006 13:46	NA
11/30/2006 14:01	2666435177
11/30/2006 14:16	NA
11/30/2006 14:31	NA
11/30/2006 14:46	NA
11/30/2006 15:01	2653041914
11/30/2006 15:16	NA
11/30/2006 15:31	NA
11/30/2006 15:46	NA
11/30/2006 16:01	2693126189
11/30/2006 16:16	NA
11/30/2006 16:31	NA
11/30/2006 16:46	NA
11/30/2006 17:01	2658366411
11/30/2006 17:16	NA
11/30/2006 17:31	NA
11/30/2006 17:46	NA
11/30/2006 18:01	2705885426
11/30/2006 18:16	NA
11/30/2006 18:31	NA
11/30/2006 18:46	NA
11/30/2006 19:01	2707635675
11/30/2006 19:16	NA
11/30/2006 19:31	NA
11/30/2006 19:46	NA
11/30/2006 20:01	2721482049
11/30/2006 20:16	NA
11/30/2006 20:31	NA
11/30/2006 20:46	NA
11/30/2006 21:01	2712886423
11/30/2006 21:16	NA
11/30/2006 21:31	NA
11/30/2006 21:46	NA
11/30/2006 22:01	2720426598
11/30/2006 22:16	NA
11/30/2006 22:31	NA
11/30/2006 22:46	NA
11/30/2006 23:01	2724468912

#read data in as zoo object
# chron
library(chron)
fmt.chron <- function(x) {
   chron(sub(" .*", "", x), gsub(".* (.*)", "\\1:00", x))
}
z1 <- read.zoo(textConnection(Lines), sep = ",", header = TRUE, FUN = fmt.chron)

the above data will not plot

#rplot
plot(z1)