Probability occupancy grid with Turtlebot's Gmapping?

Kinetic, Ubuntu 16.04 Turtlebot3 using Gmapping Gmapping uses a threshold to turn its maps into a binary map of cells that have either 'occupied' or 'free' (or 'unknown'). However, I need to use the probabilistic occupancy grid map with its full range of values. I've looked around the code, and [previous answers](https://answers.ros.org/question/35574/how-can-i-build-probability-maps-with-gmapping/) The problem is that I don't have a gmapping package; I have a turtlebot3 package. I can't find code where it applies the treshold to a probability map to turn it into a binary map. I just have files like: and (Lots of files, I cant post all of the files in here, but can add if required) I was told by my supervisor that I should be able to get the probability maps "in two or three lines of code", but remain in the dark as to how to go about it. I can't seem to find where Turtlebot's Gmapping is storing these probability maps / topics. How do I get the probability maps?