Scatter chart needs lines to connect data points of same data series

Hello everyone....I have a chart in the attached Excel file. And I need to connect the data points belonging to the same data series with lines. i.e. for the data series "A"...I would like a line connecting the €7.99 value to the €21.49 value.

And for series F, a line connecting the €14.85 to the €17.85 to the €22.85 figures.

Do you have any idea how I can do this please? Help desperately needed and appreciated! Thank you very much indeed!