Calculate Heliostat Total in SamUL

I was reading a posting on the forum about calculating the total number of heliostats in SAMuL ( Could not find output fields (SamUL, Molten Salt Tower) ) This post references an array named csp.pt.sf.user_field. I can't find this variable in the current input variable list and when I try to use it I can an undefined function call. What is the current way to get to the total number of heliostats in the solar field using SAMuL with a molten salt tower model?
The variable name for the total number of heliostats is csp.pt.sf.num_heliostats.
The variable csp.pt.sf.user_field is an array that stores the table showing the number of heliostats in each section of the field that you see on the Heliostat Field input page.
Please try running the SamUL script in the attached .zsam file (link just below this message) to see how to get those variables' values.
Best regards,

Paul.