Here are a two images of a map with the cliff frequency turned from 100% to 17%
![Image](https://forums.factorio.com/images/ext/088ef5c030a96fb9231ed8183070ff0b.png)
![Image](https://forums.factorio.com/images/ext/7a1d639de7f9f9e3fced9a6e8fdc530e.png)
To make sure my eyes were not deceiving me I put the two screenshots through diff checker:
![Image](https://forums.factorio.com/images/ext/b9801d01ea1f79f16383061991f2fd14.png)
The bright pink areas are the visual diff from the above image. The only changes are the slider position.
I know frequency is the "number of cliffs" but I count >20 different sets of cliffs so if this is a frequency change from 100%/17% even with some other weights there should be some sort of notable difference in these values and the result.