how do I plot a scatter plot of points respectively to the index and columns of a dataframe called OVS over a sns heatmap of another dataframe EVS, wich is a interpolated surface based on OVS values

plt.figure(figsize = (10,5))

sns.heatmap(EVS, cmap = 'coolwarm', cbar = True, yticklabels = 15, xticklabels = 20)

for i, col in enumerate(OVS.columns):
    for j, index in enumerate(OVS.index):
        plt.scatter(i,j, s = 10, c = 'yellow')

plt.show()

enter image description here

I tried using normal scatter solution, and even the sns option, but the axis simply doesn’t mathc! Every value of OVS index and columns is contained within EVS index and columns… I simply don’t understand…