Now it is time to see what MIDI files contain. Start "Gorgonzola"
mark all files related to the calibrator HD 10380 and press "SELECT".
Now calfile contains the name of the acquisition
data file, calfile the three names of the tracking
data files, calfile the name of the file for the
photometry of beam A (AOPEN), and calfile the
name of the file for the photometry of beam B (BOPEN). Now the hooks on the data
files are defined. To read in for example the acquisition data just type
This will last for a few seconds and the data is read into the variable
the 100th frame of beam B (data1) is displayed. Since
each real pixel on the detector is shown as one pixel on your monitor, it's a good
idea to magnify the image, e.g. by a factor 5:
Try also e.g. a contour plot with
In the image below the first output is displayed as an inset
One can clearly discriminate the boundary of the beam (circular border) from the
light coming from the delay line tunnel (arcs above and below the center), and the
sky (center). The sky is darker than the contribution from the tunnel. The source is not
visible yet! The second beam (data2) is displayed below.
You should load the other datasets (i = 1,2,3) and play
This may the time you cherish to have a fast computer! It may last up to a few minutes
to load this large files!
A higher level tool to display the content of the files is "mtv". It's a little
IDL-routine that puts MIDI-windows together into one array and calls
atv with that array.
The graphical user interface is similar to that of the well known "saoimage".
To use "mtv" read the data with the above used routine
and call mtv
Below you see again the acquisition data (calfile ).
The routine used to derive the mean and the root mean square of a dataset is
It returns a table with two rows. The first, i.e.
c.data1 or c.data2
contains the mean of each of the windows over the data set. The second, i.e.
c.data1 or c.data2
contains the rms of each of the windows over the data set.