you have found one "feature" of AutoCAD - you can't use a comma as a decimal place when entering data. You will have to input the size as 19.6
as for the table, I always throw in the table as AutoCAD wants and then adjust my spacing using the properties palette. Not the right way I am sure but I find it far easier than trying to adjust the settings before hand. The one thing that puzzles me about your table though is why you need 400 lines in each data row. Reduse that to 1 and see what happens.