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I have daily values separated into sheets, one for each year. I am creating a line graph for each year and also adding a moving average with a period of 15 days, however this moving average starts 15 days in as that is when there is can be calculated meaningfully. However, since I have data for previous years, is there a way that I can use this to calculate the moving average without actually plotting this data (as that would mess up the x-axis bounds as I can't set that manually)?

For reference, the official reference does not provide any information on customising Moving Average trendlines.

Please find an image of the current graph below.

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