can you elaborate on the "what i have to do is use a span that is equal to the time range picker."? The picker will provide a earliest and latest for the entire search to look over, where the span is duration to take each avg over. So if you search all of yesterday, then a reasonable span might be 15min for example (meaning show the avg every 15min for all of yesterday). so having a span that is equal to the time range is simple taking a single avg over the entire time, which you'd do with stats instead of timechart.
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