The figure in sut81009.gif shows a representation of two fields terminated by ',' and optionally enclosed by '"'. Field 1 is enclosed by '"', begins with three whitespace characters, and then contains the letters aaaa. A nonwhitespace character (in this case, a comma) signals the end of the field.
Field 2 starts after four whitespace characters. It contains the letters bbbb, and is terminated by ','.
End of description.