Hi Simon, I was trying to add WT and other covariates to the model. First, I wanted to see the covariate plots. When I checked the covariate related plots in the Results Tab, such as “Pop Covariate Plots” after execution, I got a message “There is not enough data to create the plot”. It looks like the covariate data are not recognized by the model. It a .csv file. Is there a special format needed for the input of continuous type covariates or categorical type covariates? Thanks for the help! Wendy