Skewed gaussian curve fitting

I have a hard time to do curve fitting for my data. My data is only 9 points. Trying to fit a skewed gaussian curve for (X=pos, Y=Arg). Is there a tool can do it? Or how should I do the skewed gaussian curve fitting?

>> Arg

Arg =

Columns 1 through 8

    1.2371    0.9618    2.8333    2.9293    2.5981    2.2731    1.4793    0.4682

Column 9

    0.1772

>> pos

pos =

    -4    -3    -2    -1     0     1     2     3     4