'What function to I need to plot in MATLAB to get the reflection of this graph?

I have confused myself slightly. I have plotted 1 - 0.95^(x) in MATLAB and got this graph.enter image description here

However I want the reflection of this about '50' on the x axis whereby I can get a near 1 penalty for low x values and then the penalty starts to decrease as x increases. Does anyone have any suggestions on the function I would need for this I appear to be having a mind blank!

Thanks



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