Since all your X axis are the same, you could make all the lines about a given parameter into groups, including the reflines. This would mean adding some observations to your dataset to draw the reflines.
group = "LOWER";
valueACTW = lwrw;
time = minTime; output; time = maxTime; output;
group = "UPPER";
valueACTW = uwrw;
time = minTime; output; time = maxTime; output;
and then
series x = Time y = valueActW / group=group ...;
but also using a discrete attribute map dataset to control the appearance of the groups (lines).
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