MIAEWS

• Caveats when plotting the group delay

• Getting FITS header keywords that are not in the main header but in some table

• alternative explanation for why we do a Fourier Transform for finding the groupdelay

• explanation of display when /shiftmask option is selected

• Running the C debugger in case there are problems

• Examples of fringe tracking diagnosis

• Things to consider when reducing data of weak sources

Installation

• Compile with cl_install in the expanded archive directory

• Running MIA+EWS on data in deeply nested directories
• Known bugs

• oirChopPhotoImages and oirgetdata and other data formats (e.g. calphot.fits)

• David Raban's EWS user guide (PDF)

• oirnewdata: Create new FITS files (OIDATA format)
• midiputvis: Create new FITS files (OIVIS format)

Data Reduction tips

• Background subtraction How To

More tips

• What to do if for some reason you only got one of the two photometries
• What to do if you cannot chop your images since all tartyps are 'T '?
• Why does the ozone feature appear in absorption / emission in my correlated flux / photometry
• Why should I do off-zero tracking in MIDI to improve SNR especially for weak sources?

Extra-documentation for built-in MIA+EWS functions

• oirChopPhotoImages and oirgetdata

• oirChopPhotoImages

Sparsely documented functions

• oirnewdata: Create new FITS files

• Document describing the Sci-Phot Reduction

Sci-Phot Reduction

SciPhotReduction

• Phases

MIA+EWS issues

• Running MIA+EWS on data in deeply nested directories

It is recommendable to download the daily snapshot of MIA+EWS and not use the latest version (1.6) which apparently does not work with current MIDI data.

It is recommendable to download the daily snapshot of MIA+EWS and not use the latest version which at the moment (Nov 2009) apparently does not work with current MIDI data.

• Other undocumented things?

• Atmospheric absorption
• Phases

• Weak Sources?

Functions

• oirChopPhotoImages
  • does the chopping for photometry files; if read in with oirgetdata, returns a struct array of 7, i.e.
    • 0: best estimate for Target - Sky
    • 1...5: split-ups of photometry (for 8000 frames, i.e. 0...1599, 1600...3199, ...)
    • 6: Sky

• MIA+EWS at Leiden

• Diagnosis of fringe tracking
• Atmospheric absorption

• Flags

MIA+EWS Change log

• Why should I do off-zero tracking in MIDI to improve SNR especially for weak sources?
• Diagnosis of fringe tracking

• I am chopping at 2 Hz and subtracting lots of things. Why are my data still background dominated?
• Why should I do off-zero tracking in MIDI to improve SNR especially for weak sources?

• Why does the ozone feature appear in absorption / emission in my correlated flux / photometry
• I am chopping at 2 Hz and subtracting lots of things. Why are my data still background dominated?

Rescuing / Understanding Data

• What to do if you cannot chop your images since all tartyps are 'T '?
• Why does the ozone feature appear in absorption / emission in my correlated flux / photometry

• Copies file structure of templatefile in newfile (if /copyhead is not set)

Rescuing Data

• What to do if for some reason you only got one of the two photometries
• What to do if you cannot chop your images since all tartyps are 'T '?

• File structure?
• Typical data reduction process (verbose comments!)?
• MIA+EWS on the Mac

• Copies file structure of templatefile in newfile (if /copyhead is not set)

mia+ews journals:

• next: 2007-12-12T15_10:40.log

Typical data reduction process (verbose comments!)

 cd, '/disk1/burtscher/MIDIDATA/2007-11-23'

Change IDL's working dir to the dir where the files that you want to reduce

 scitag='/disk1/burtscher/reduceddata/2007-11-23/2008-02-19/1365a'
 caltag='/disk1/burtscher/reduceddata/2007-11-23/2008-02-19/016815a'

Specify where the reduced files will be saved

 scifiles=midiguis()
 calfiles=midiguis()

Open the MIDI file picker Gorgonzola to pick target (sci) and calibrator (cal) files

 midipipe,scitag,scifiles,smooth=20,gsmooth=20,dave=1
 midipipe,caltag,calfiles,smooth=20,gsmooth=20,dave=1

Here the possibilites begin... Run midipipe with the necessary arguments tag and files and choose which options you want to set. Same options for sci and cal files. More on midipipe-options?

 midicalibrate, scitag, caltag, calflux10=6.59,diam=2.23

To use reduced cal-files to calibrate reduced sci-files. Produces [scitag]calPlots.ps in working dir.

File structure

My file structure for reducing MIDI files is:

• /disk1/burtscher/MIDIDATA/YYYY-MM-DD/: This is the place for all raw files at YYYY-MM-DD. Note that it is handy if you are able to write in this directory as you can then use midiguis() that writes an index of all files in the directory and is much faster than midigui() that doesn't need write permission in the midi raw files directory.
• /disk1/burtscher/reduceddata/YYYY-MM-DD/yyyy-mm-dd/: This is the place where I save all data I reduced on yyyy-mm-dd for the observation that took place on YYYY-MM-DD. Within this directory I use tags such as 1365sci, 1365cal etc.

Hidden Features

• oirnewdata
  • Syntax: oirnewdata, templatefile, newfile, data, /copyhead
  • Copies data (struct like the one you get with oirgetdata) with header of templatefile in newfile (if /copyhead is set)
  • Copies file structure of templatefile in newfile (if /copyhead is not set)

MIA+EWS on the Mac (experimental)

• std=c99 instead of pedantic in c/src/Makefile
• in c/src/table_col.c malloc.h must be sys/malloc.h (according to http://www.idevgames.com/forum/archive/index.php/t-13712.html )