Nothing

```
plot.panelAR <- function(x,legend=TRUE,rot.axis=c(0,0),...){
if(class(x)!="panelAR"){
stop("x must be of class 'panelAR'.")
}
obs.mat <- x$panelStructure$obs.mat
N.time <- ncol(obs.mat)
N.panel <- nrow(obs.mat)
times <- colnames(obs.mat)
units <- rownames(obs.mat)
image(z=t(obs.mat), ylab="", xlab="Time", axes=FALSE, col=c("darkred","wheat"),...)
axis(1, at = seq(from = 0, to = 1,
length = N.time), tck = 0, labels=FALSE, lwd = 0, las = 2)
text(seq(from = 0, to = 1,
length = N.time), par("usr")[3], labels = times, srt = rot.axis[1], pos = 1,
xpd =TRUE, cex=par("cex.axis"))
axis(2, labels = FALSE, at = seq(from = 0,
to = 1, length = N.panel), tck = 0, lwd = 0,
las = 1)
text(par("usr")[1],seq(from = 0, to = 1,
length = N.panel), labels =units, pos = 2, xpd = TRUE, cex=par("cex.axis"),
srt=rot.axis[2])
if (legend) {
par(xpd = TRUE)
legend(x = 0.95, y = 1.1, col = c("darkred","wheat"), bty = "n",
xjust = 1, legend = c("Missing", "Observed"),
fill = c("darkred","wheat"), horiz = TRUE)
}
}
```

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