Global sensitivity analysis Morris Method

Hi
In the global sensitvity analysis Morris method example (Lotka Volterra gsa), the input arguments are
“total_num_trajectory=1000,num_trajectory=150”

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.
Thanks
Vijaya