Global sensitivity analysis Morris Method

In the global sensitvity analysis Morris method example (Lotka Volterra gsa), the input arguments are

The number of parameters in the equations are 4 so generally in the Morris method the number of runs are r*(p+1) where p is the number of parameters and r the number of different realizations. So here it would be total_number should be 5xr and num_traj should be 5. So I am unable to figure out how you get the number 1000 and 150 in the above example. Can you please clarifiy.