I recently purchased an assorted bag of ceramic disc capacitors from radio shack. I need some guidance in interpreting the labels. I understand that the first two numbers are the significant figures and the third (if present) is the number of zeros to be annexed to the first two numbers which then is the rating in picofarads, however, my question has to do with how some of the capacitors have there numerical labels underlined and others do not. I have a picture of these capacitors if anyone needs to see it. I could Really use a good pdf tutorial on this. Your help will be very much appreciated as I am attempting to build my first electronic project: and audio amplifier with the LM386N analog IC.