How to read carb calibration chart?

There's another chart that goes along with that for the secondaries as well. Generally when you change the primary setting which that mostly covers do you want to change the secondary setting as well. I know it's rich and all that but how does the car run? and also how do you run it do you idle it alot or do you get on it and really drive it?..
The number one in the middle of the chart is the number one setting... The factory setting. .1113 jets and .068/.047 metering rods.. the first thing I would do would be to not change the Jets and not open up the carb but just try changing the metering rods... The next step leaner is the number 20 setting with the same Jets but 70/54 metering rods.. you can see these rods have bigger numbers which means they are bigger and thicker and more so in theory plugging up the same whole more and allowing less fuel..
When you pull those rods out he'll notice their riding on top of some Springs and those are the Springs are talking about...
I've changed the Springs a couple steps on my carburetors and had dramatic differences in performance with changing those alone...