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From your description and screenshot, it looks like you're currently working in Google Excel rather than Microsoft Excel. Since I don't have access to Google Excel environment to test directly or provide exact steps for that platform.
However, I did try to reproduce your scenario using Microsoft Excel. I was able to select non-adjacent cells and create a chart that includes both X and Y axes. If by "Y axis" you're referring to plotting the progress values over time, that kind of setup seems to work fine in Excel based on my testing.
I hope this Excel example is a helpful reference. For more detailed guidance specific to Google platform, please contact Google’s Help Center or its forums.
If you have any further questions or concerns, please don't hesitate to reach out.
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