Impedance of the inverted L versus number of radials

Before removing the radials of the inverted L (in fact 2x inverted L for 160m and 80m, but connected to a common balun and common radial system) to restart lawn mowing, I conducted some tests to observe the effect of the number of radials on the impedance properties of the antenna. First with 10 radials, each 21m long, then with only 4 radials, and finally with a single one. It should be noted that there is a 1:2.47 balun present in this system.

I did the test for both 80m and 160m.