Introduction¶
Scope¶
This document describes how to reduce ESPRESSO data with the ESO Data Processing System (EDPS) - a user-friendly Graphic User Interface (GUI). The EDPS is user-oriented, but it is also employed internally at ESO for quality control on a regular basis. Please note that EDPS should not be called a pipeline. Instead, it is an environment for executing the ESO pipelines, including the ESPRESSO pipeline. Other environments are Reflex (also a GUI, but in the process of being phazed out) and the command-line-based esorex. The actual ESO pipelines are the instrument-specific collections of recipes that are designed to process data from a given instrument. Specific details on the ESPRESSO data reduction stream and how to configure the reduction to meet specific scientific needs are also described.
The data processing with EDPS is done with workflows – dedicated instrument-specific Python scripts that remove the instrument signature from the raw science data. The ESPRESSO data reduction workflow is called espresso_wkf. Workflows are dedicated instrument-specific (and sometimes mode-specific) Python scripts. They facilitate automation, easy repeatability, and collaboration, which are important for data-heavy projects. This system is flexible – with appropriate configuration, the users can run batch processing on large data sets or, alternatively, the data can be processed flexibly, repeating one or a few data sets with different parameters, seeking the data reduction strategy that best suits their science goals.
EDPS is the recommended environment to reduce data from the instruments at the ESO telescopes, especially for users who want to learn and experiment with the forthcoming environment for ESO pipeline execution that will be used with the pipelines of the next generation of ESO instruments. It is well suited for processing large data sets in batch mode or for users who who want to (re-)process calibration data independent of science data. EDPS takes better advantage of the internal parallelization in recipes than any other pipeline execution environment. It also accounts for changes in the instrument hardware when organizing the data through the so-called “break points”.
For a more extensive documentation on the EDPS-GUI itself, consult the dedicated manual here.
For a brief description of EDPS and its main concepts, see here.
The ESPRESSO pipeline itself is described in detail in a pipeline manual.
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