4.1 Overview
 4.2 Selecting between 2d and 3d runs
 4.3 Debug or optimized mode
 4.4 Visualizing results
  4.4.1 Visualization the graphical output using Visit
  4.4.2 Visualizing statistical data
  4.4.3 Large data issues for parallel computations
 4.5 Checkpoint/restart support
 4.6 Making ASPECT run faster
  4.6.1 Debug vs. optimized mode
  4.6.2 Adjusting solver tolerances
  4.6.3 Adjusting solver preconditioner tolerances
  4.6.4 Using lower order elements for the temperature/compositional discretization
  4.6.5 Limiting postprocessing
  4.6.6 Switching off pressure normalization
  4.6.7 Regularizing models with large coefficient variation
  4.6.8 Using multithreading
 4.7 Input parameter files
  4.7.1 The structure of parameter files
  4.7.2 Categories of parameters
  4.7.3 A note on the syntax of formulas in input files
  4.7.4 Compatibility of input files with newer ASPECT versions
 4.8 A graphical user interface for editing ASPECT parameter files
  4.8.1 Installing parameter-GUI
  4.8.2 Using ASPECT-GUI