In order to create some custom pads for my PCB, I have given this command: 40R20 command from Orcad Package and have got the following pad (Fig-1) on a screen of 10 mil/div. My questions are:
1. What is 40?
2. What is R?
3. What is 20?
4. What does that blue colored circle refer to?
5. What does that grey colored annular ring refer to?
Figure-1:
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