There appears to be a single "\n" missing from the body of stats:::summary.stl, 
causing the "Time.series components" and "IQR" sections to butt up against each 
other. The fix should be to simply switch 

    cat(" IQR:\n")

for

    cat("\n IQR:\n")


While looking at this function I wondered: Has it been considered to include a 
printout of explained variance? 
For example, following the IQR pattern:

    cat("\n Variance:\n")
    exv <- apply(cbind(STL = object$time.series, data = object$time.series %*% 
        rep(1, 3)), 2L, var)
    print(rbind(format(exv, digits = max(2L, digits - 3L)),
        `   %` = format(round(100 * exv/exv["data"], 1))), quote = FALSE)


—Aksel

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