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PIPELINES AT ESO

This page provides information about pipeline processing and data types.

Raw data are selected, associated and inserted into a reduction mechanism which produces calibration products, science products and quality control information. This mechanism is the data processing pipeline. There is one such pipeline for each VLT and VLTI instrument.

Find general information about ESO reduction pipelines here.

FUNCTIONALITIES

The main functionalities of the pipelines are:

  • create master calibration data,
  • reduce science frames,
  • extract QC information from the data.

QC Garching creates master calibration data from all raw calibration data. The raw data are stored in the ESO Archive and are public. They are quality-checked and used for data reduction and for trending.

Before October 2011 QC Garching processed science data, using the best available, quality-checked master calibration data. As of October 2011 this service is not offered anymore.

OPERATIONS

There are two instances of the data reduction pipelines:

  • at the instrument workstation on Paranal, running in automatic mode,
  • at HQ Garching, run by the Quality Control Group in the optimized mode.

The automatic mode is used for quick look purposes and for on-site quality control. It processes all raw data sequentially, as they arrive from the instrument. If calibration products ("master calibrations") are required for processing science data, these are taken from a database with standard, pre-manufactured calibration products. The automatic mode is not tuned to obtain the best possible results.

The optimized mode is the mode, which uses all data of a night, including the daytime calibrations. The calibration data are sorted and grouped according to their dependencies. Master calibration data are created. Their quality is checked.

UVES PIPELINE: GENERAL

The UVES pipeline was originally written as a MIDAS context. It then was extended to support FLAMES/UVES data. In 2007 it was ported to the ESO Common Pipeline Library framework supporting both UVES and FLAMES/UVES data. In 2011 Reflex Workflows for UVES were implemented. The latest CPL version (both in standalone and integrated into Reflex) of the pipeline together with documentation (including User manuals and a Reflex tutorial) and test/example datasets are available here.

 

CALIBRATION, REDUCTION

Find the description of calibration processing and recipes here and science reduction and recipes here.


SUPPORTED MODES AND SETTINGS

The UVES pipelines installed in Garching and on Paranal support all four flavours of UVES data:

  • ECHELLE,
  • ECHELLE,ABSORPTION-CELL,
  • ECHELLE,SLICER,
  • ECHELLE,ABSORPTION-CELL,SLICER.

It also processes all FLAMES/UVES data.

The quick-look pipeline on Paranal processes any kind of UVES data.

FILE FORMAT

Raw UVES frames come in the following CCD formats :

  blue arm (1 CCD) red arm (2 CCDs)
format (X,Y),
1x1 binning
2148 x 3000 px
4296x4096 px
pre/overscan
2x50 = 100 px
4x50 = 200 px

Apart from 1x1 binning, there is also 1x2, 2x2 and 2x3 binning possible.

Master calibration files (master BIAS, master FLAT) have the prescan and overscan regions chopped off. Master files for the red arm come in twins for either of the red CCD. Usually the CCDs are called BLUE, REDU = red upper, and REDL = red lower. All master files are rotated by 90 degrees. The red masters are in addition flipped. Blue 1x1 binning master files have the format 3000x2048 px, red master files 4096x2048 px. For 2x2 binings, divide these numbers by 2.

Raw calibration files, raw science files, and master calibration files, have the following approximate sizes in MB:

  raw BLUE
raw RED
1x1
12,6
34,4
2x2
3.2
8.6
  master BLUE master REDU master REDL
1x1
24.0
32.8
32.8
2x2
6.0
8.2
8.2