User guide# Model system: 1D ideal gas in a linear external potential Data Organization Basics Data Structure Input formats and resampling Vector observables Temperature Extrapolation/interpolation Temperature independent average observable Temperature dependent average observable Temperature independent negative logarithm of average observable Temperature dependent negative logarithm of average observable Temperature interpolation Macrostate distribution extrapolation Extrapolation in volume and custom derivatives GP Models Utilizing Derivative Information and Active Learning Gaussian Process Models Active Learning