If each variable is 1x5000 then your original code is creating a 1x35000 block of data when you put it in the table. This is valid since a table can have multi-column variables.
What you want to do is flip the vectors to 5000x1, giving you a 5000x7 table, then rows2vars will make that 7x5000.
t = table(time', area', volume', radii1', radii2', centre1', centre2');
t = rows2vars(t);
writetable(t, append(save_name,'.xlsx'))
Another way to do this is to write each as a row in a large matrix. (Assuming each is a double)
writematrix([time; area; volume; radii1; radii2; centre1; centre2], filename)
Or if time is datetime, or duration
writematrix(time, filename)
writematrix([area; volume; radii1; radii2; centre1; centre2], filename,"Writemode","Append")
