# Installing DCR¶

Acknowledgement Note

Please cite: Pych, W., 2004, PASP, 116, 148

In terms of cosmic ray rejection we shifted to a non-python package because the results were much better compared to LACosmic’s implementation in Astropy. LACosmic was not designed to work with spectroscopy. Though since version 1.1.0 we shifted from Astropy to Astroscrappy’s implementation of LACosmic.

The latest version of the Goodman Spectroscopic Pipeline uses a modified version of dcr to help with the pipeline’s workflow. It is included under

<path_to_download_location>/goodman_pipeline/goodman_pipeline/data/dcr-source/dcr/

goodman_pipeline-<version> is the folder that will be created once you untar or unzip the latest release of the The Goodman Pipeline.

Important

The changes we made to DCR include deletion of all HISTORY and COMMENT keywords, which we don’t use in the pipeline. And addition of a couple of custom keywords, such as: GSP_FNAM, which stores the name of the file being created. GSP_DCRR which stores the reference to the paper to cite.

You are still encouraged to visit the official Link. We remind again that users of the Goodman Pipeline should cite the DCR paper with the reference indicated above.

## Compiling DCR¶

Compiling dcr is actually very simple.

cd <path_to_download_location>/goodman_pipeline/goodman_pipeline/data/dcr-source/dcr/

Then simply type:

make

This will compile dcr and also it will create other files. The executable binary here is dcr.

We have successfully compiled dcr right out the box in several platforms, such as:

• Ubuntu 16.04

• Centos 7.1, 7.4

• MacOS Sierra

• Solaris 11

## Installing the DCR binary¶

This is a suggested method. If you are not so sure what you are doing, we recommend you follow the steps shown below. If you are a more advanced user and you want to do it your own way, all you have to achieve is to have the dcr executable binary in your $PATH variable. 1. Open a terminal 2. In your home directory create a hidden directory .bin (Home directory should be the default when you open a new terminal window) mkdir ~/.bin 3. Move the binary of your choice and rename it dcr. If you compiled it, most likely it’s already called dcr so you can ignore the renaming part of this step. mv dcr.Ubuntu16.04 ~/.bin/dcr Or mv dcr ~/.bin/dcr 4. Add your $HOME/.bin directory to your $PATH variable. Open the file .bashrc and add the following line. export PATH=$PATH:/home/myusername/.bin

Where /home/myusername is of course your home directory.

5. Close and reopen the terminal or load the .bashrc file.

source ~/.bashrc