The term 'minute amounts' refers to very small amounts of something. This can be seen in the four crossword solutions given: BITS (4 letters), TRACES (6 letters), IOTAS (5 letters), and GRAINS (6 letters). BITS refer to a very small amount of digital information, while TRACES are small amounts of physical evidence. IOTAS are tiny amounts of something, and GRAINS are the smallest unit of measurement for mass or weight. All of these words refer to very small amounts, which is what the term 'minute amounts' implies.