SMART Spectral Extraction

new feature in Smart version 7.0.0 and up: when the source is not found by the Tapered Column algorithm, the user can choose to skip the image, extract at the nod position or go to manual extraction. THERE IS NO DEFAULT EXTRACTION ANYMORE.

Extraction is the process of converting an image from the spectrograph into a spectrum.
A discussion of extraction is contained in the paper :
[[smart_paper.pdf][ "The SMART Data Analysis Package for the Infrared Spectrograph on the Spitzer Space Telescope"]] Higdon et al. PASP 116: 975-984, 2004

The "Extract" button on the "Dataset" window runs data extraction.
To perform a data extraction first ensure that all the required files are within the current dataset displayed in the "Dataset" window. Then highlight them to select for extraction.
Between one and all the files in the dataset may be selected. If two or more files are selected together they are merged and extracted in one operation.
Merging is controled by the setting of "sm_mergetype" user parameter on Calibration Selection. Ensure that "sm_mergetype" is set to the required value before running extraction.

To begin extraction click the "Extract" button. This displays a window titled "Select Extraction Type:", listing the different extraction types available :

A description of the different extraction types can be found at Spectral Extraction Types.

Select one extraction type by clicking on it and then click "Extract" to run an extraction. Clicking "Quit" will close the "Select Extraction Type" window and return to the "Dataset" window without running an extraction.

Running a successful extraction will display the SMART IDEA main window, headed "SMART IDEA : Spitzer/ISO Spectral Analysis Package". (This is a modified version of the GUI from the ISAP spectral analysis package.) After running an extraction, the extracted data is loaded into the SMART IDEA window. The data there is ready for the start of your analysis. An introduction to using the window can be found at IDEA Basic Analysis.

Extraction may be repeated multiple times in a single session of the SMART IDEA window. Each extracted set of data is treated seperately. (They may later be intentionally combined with the "Merge with Prime Data Set" function.) When a second or subsequent extraction is successfully completed a message box ("Acknowledge") appears :

Click "OK" to continue. The newly extraced data will be loaded to the SMART IDEA window. The data sets in use in the window may be listed by clicking the "Store" button. (See IDEA Stored Data Sets.)

Extracted data is listed in the "Store" window with the default name :

Object_module_nod(_offn)

Where "_offn" is an optional extension added to "off nod" data sets only. "n" is an integer (1 or 2) designating which low resoloution slit is being nodded.

EG : ABC123_SL1_1st - Object ABC123 in short low 1 (first slit/order) and first nod position.