Introduction

The 2PCF-GC Processing Function is in charge of measuring the 3D two-point correlation function of Euclid galaxies. All the 2PCF-GC output data products can be obtained from the same input products, and using a similar methodology.

Optionally, the code can receive as input random pair counts from a previous run. The code computes and stores only the pair counts not read in input.

The flowcharts of the 2PCF-GC products are the following:

• Angle-averaged two-point auto-correlation function

• Angle-averaged two-point cross-correlation function

• Post-reconstruction angle-averaged two-point auto-correlation function

• Post-reconstruction angle-averaged two-point cross-correlation function

• 2D Cartesian two-point auto-correlation function and projected two-point auto-correlation function

• 2D Cartesian two-point cross-correlation function and projected two-point cross-correlation function

• Post-reconstruction 2D Cartesian two-point auto-correlation function and post-reconstruction projected two-point auto-correlation function

• Post-reconstruction 2D Cartesian two-point cross-correlation function and post-reconstruction projected two-point cross-correlation function

• 2D polar two-point auto-correlation function and multipoles of the two-point auto-correlation function

• 2D polar two-point cross-correlation function and multipoles of the two-point cross-correlation function

• Post-reconstruction 2D polar two-point auto-correlation function and post-reconstruction multipoles of the two-point auto-correlation function

• Post-reconstruction 2D polar two-point cross-correlation function and post-reconstruction multipoles of the two-point cross-correlation function