Thanks for the compliment, Pops. But a key point of these challenges is that we get to take inspiration from each other. For my part, you are welcome to any votes that come your way. I like how your image came out: sharp, clear, bright. I see that you have made the same calculation on your circular slide rule as I had made on my conventional, straight slide rule; 11 x 11 is still 121! LOL. Best wishes. Regards, Charlie.