Spherical Harmonics decomposition

The power spectrum data and appropriate covariance matrix from Percival (2004) are available as text files from the links below. A simple C program that demonstrates how the likelihood can be calculated from the data files is also available. 

• paper describing spherical harmonics decomposition

• paper describing real space power spectrum, and fit to likelihood surface

• The real-space data & parameters of likelihood surface  (see header for details)
  
 
• The covariance matrix and its inverse
  
 
• Simple C code to calculate the likelihood of a simple model using the data files