Create a plot showing the null TXI distribution sample compared to the observed test TXI values across developmental stages.
Details
This function creates a visualization of the null hypothesis testing by plotting: - Gray lines representing individual null TXI samples from permutations - A horizontal line showing the mean of null distributions - A colored line showing the observed test TXI values
The plot helps visualize how the observed TXI pattern compares to what would be expected under the null hypothesis of no conservation signal.