Reducing the observations

• Preliminaries
• Format conversion
• Reductions --- at last!
  • Robust fits and bad points
  • Subtraction of dark and sky measurements
  • Sky models
  • Using the sky model
• Choosing a gradient estimator
• Extinction and transformation models
  • The bias problem
  • Equations of condition
  • Strategy
  • Standard stars
• Reduction procedure
• Final results
  • Residual plots
  • Estimated parameters
  • Individual data
  • Logfile output
  • Table file output
• Interpreting the output
• Special problems
  • Missing bands
  • Nonlinearity
  • Special systems
  • Marginal nights
  • Sky problems
  • CCD data
  • Problems with star names