How can I make a plot smoother?

Hi,

I am plotting a set or results I have, for instance:

X=[70:-3:0];

example=[1.6626E-12     3.4713E-12     1.2833E-11     5.0116E-11     1.9644E-10     7.7019E-10     3.0197E-09     1.1840E-08     4.6420E-08     1.8200E-07     7.1358E-07     2.7978E-06     1.0969E-05     4.3008E-05     1.6863E-04     6.6114E-04     2.5922E-03     1.0163E-02     3.9847E-02     1.5623E-01     6.1255E-01     1.0000E+00     1.0000E+00     1.0000E+00];

plot(X,example)

As you can see in the figure, as I do not have too many results in some points, there are sharp point that I'd like to make them smoother. I have been trying to do it with the functions 'polyfit and polyval' and on the other hand with the function 'smooth' but I didn't get the results I'd like to. Can any anyone give me any suggestion?

Thanks in advance!