ECHOMOP—Echelle Data Reduction Package

SUN/152.4

Starlink Project
Starlink User Note 152.4

Dave Mills, John Webb & Martin Clayton

2003 July 14

Version 3.3-7

Users’ Manual

Abstract

echomop provides facilities for the extraction of spectra from 2-D data frames. These data can be single-order spectra, or multi-order échelle spectra.

A substantial degree of automation is provided, particularly in the traditionally manual functions for cosmic-ray detection and wavelength calibration; manual overrides are available.

Features include; robust and flexible order tracing, optimal extraction, support for variance arrays, and 2-D distortion fitting and extraction.

1 INTRODUCTION
1.1 Summary of Facilities
1.2 How to Use this Document
1.3 Demonstration
2 USING ECHOMOP
2.1 Getting Started
2.2 ECHMENU
2.3 Graphic Display
2.4 Image Display
2.5 Parameters and Prompts
2.6 Tuning Parameters
2.7 Processing Steps
2.8 Repeating Steps
2.9 Standard Steps
2.10 Accessing Single Function Sub-options
2.11 Automation
2.12 Quick-look Mode
2.13 Error Arrays
3 ECHOMOP TASKS & ECHMENU OPTIONS
4 PARAMETERS
5 AUTOMATIC REDUCTIONS
6 USING PRIOR REDUCTIONS—CLONING
7 ECHOMOP TIPS
7.1 Multi-Object Spectra
7.2 Longslit Spectra
7.3 Extended Objects
7.4 Detector Types
7.5 Cosmic Rays
7.6 Readout Noise
7.7 Flux Calibration
7.8 Blaze Function
7.9 Scattered Light
7.10 Arc Frames
7.11 Viewing 2-D Correction
7.12 Viewing Spectra
7.13 Heliocentric Correction
8 INPUT DATA FILES
8.1 Reduction Database
8.2 Data Frame Format
8.3 Saving Disk Space
8.4 Arc Line Lists
8.5 Structure Definition File
8.6 Multiple Arc Frames
8.7 Multiple Object Frames
8.8 Flux Calibration Frames
9 OUTPUT DATA FILES
9.1 Output Spectra
9.2 Reduction Database
10 FIGARO ECHARC IMPORT/EXPORT
A NOTES FOR OBSERVERS
A.1 Orientation of Spectra
A.2 CCD Bias Frames
A.3 CCD Overscan Region
A.4 CCD Dark Count
A.5 Flat Fielding
A.6 CCD Correction From Observed ADU to Photon Counts
A.7 Arc Frames
A.8 Preparing for a Reduction
B PROBLEM HINTS
B.1 Needs Rotating
B.2 Bad X Dimension
B.3 Bad Y Dimension
B.4 Vmem Exhausted
B.5 Vmem Release
B.6 Dimension Conflict
B.7 No Orders
B.8 Bad Diagonals
B.9 Wave-fit Start/end
B.10 Wave-fit Deviations
B.11 Cannot Create DB
B.12 Feature List Too Small
B.13 No Trace Width
B.14 Corrupt DB
B.15 Bad Sky Below
B.16 Bad Sky Above
B.17 Bad Lower Dekker
B.18 Bad Upper Dekker
B.19 Lost Left Trace
B.20 Lost Right Trace
B.21 Untraceable
B.22 Cannot Create ECH_RDCTN
B.23 Cannot Create ECH_FTRDB
B.24 Not a Reduction Format
B.25 No Update Access
B.26 Cannot Create Here
B.27 No Cloneable Object
B.28 Read-Only RDCTN File
C RELEASE NOTES
C.1 VERSION 3.3-0
  Changes & New Features
  Documentation notes
  Fixes
C.2 VERSION 3.2-0
  New features
  Documentation
  Parameter default changes
  Other changes
  Fixes

Abstract

Contents