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probability distributions – Could any one give an example to illustrate "a family of curves parallel to the x-axis"?

This wiki page says

From a geometric point of view, if we consider $$f (x | theta)$$ according to two variables, the family of probability distributions can be seen as a family of curves parallel to the x-axis, while the family of likelihood functions consists of orthogonal curves parallel to the x-axis. $$theta$$-axis.

I can not imagine what this kind of `parallel` look like.

Consider this particular figure, there are 3 distributions. I guess it's a family of probability distributions. If anyone has different opinions about the family of probability distributions, please discuss it here.

there are 3 curves in the figure, it does not seem reasonable to say parallel parallel to the x-axis.

Is my understanding correct?