<div>Hello, </div><div><br></div><div>I have been looking at the geoid output from CitcomS, and am not sure why a non-standard normalization is used for the Legendre polynomials in the function modified_plgndr_a. The recursion used in CitcomS differs from the algorithm given in Numerical Recipes in C (Press, 2nd Ed., p. 254). Is there a reference for the modification of the standard normalization?</div>
<div><br></div><div>Thanks very much,</div><div>Joy Hines</div><br>-- <br>Graduate Student Researcher<br>Department of Geology<br>University of California, Davis<br>2205 Earth & Physical Sciences<br>Davis, CA 95616<br>