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I created a graph / band graph / fan chart, with three variables (median, 25%- & 75%-quartiles), where the latter two form a group and therefore are depicted as a shaded area.

Unfortunately it seems that the shaded area is shifted by one period such that the median does not always lie within the shaded area. When I choose normal graph (line & symbol), there is no such a problem / shift; the median always lies within the quartiles.

Many thanks in advance.

Could you provide the workfile?

Here you are.

This looks like a bug. We'll investigate.

BTW, when the workfile range is either with monthly data or integer dates, the problem does not occur, but I need the graph with the individual dates.