tdata <- scan(file1, list(day=0, sec=0, m=0, w=0, x=0, y=0, z=0))str <- paste("eps/", file1, ".eps", sep="")postscript(str,  ,  ,  , 5, pointsize=18)par(mgp=c(1, 0, 0), tck=0.03, mar=c(2, 2, 1, 1))plot(tdata$sec, tdata$m, type="l", xlab=paste("MJD", tdata$day, "Time (s)"), ylab="LORAN-M SNR (dB)")