I am using spatstat R version version 3.0-8, to quantify spatial patterns on the distribution of solitary corals. For each sample, I am finding the following models: 1) ppm to get the CSR model , and kppm to get the best fit models for 2) for Heterogeneous Poisson using a background image file, 3) Thomas Cluster on a homogeneous background, and 4) Thomas Clusters with heterogeneous Poisson model on the background image file. I am using the minimum contrast method to compute these.