R help - Mar 2007 - dsymstb-density of symmetric stable

Dear R-User,

In regard to the fBasics package that contains some functions relating to 
the stable distribution, why is it that the integral under the 
dsymstb(x,alpha=1.5) isn't equal to 1?  Have I missed something or is there 
some minor problem?

However, if one use dstable(...), then it does the job.

I hope someone could clarify this problem.

Thanks,
Leon Au