Default Windows

Default exposure windows are used in many XRONOS applications. This mostly in order to avoid dealing with data sets which are too inhomogeneous with respect to their statistical properties. The default exposure windows are:

Minimum Exposure in Bins =0.2 (i.e. 20 % exposure)
Minimum Exposure in Newbins =0.0 (i.e. 0 % exposure)
Minimum Exposure in Intervals=0.5 (i.e. 50 % exposure)
Maximum Exposure =50.0 in Bins , Newbins and Interval (i.e. 5000 % exposure, meaning that virtually everything which is more than 100 % exposed will be accepted).

Default exposure windows are applied as follows:

In Bins and Newbins .................for applications lc1, lc2, lc3, sta, lda, asc, ef1, ef2, ef3 and efs.
In Bins, Newbins and Intervals ......for all other applications

Note that this is done mainly for protection purposes, to maintain the statistical quality of the results from different intervals as homogeneous as possible. For example suppose that you have a 136 newbin series of which you want to calculate the average power spectrum in intervals of 64 newbins each. Three intervals will be accumulated, two with 64 newbins each and one with 8 newbins. If there were no exposure windows in intervals, the power spectrum the third interval (containing only 8 newbins, i.e. 12.5 % exposed) would be averaged with the power spectra of the first two intervals (both containing 64 newbins, i.e. 100 % exposed).

The side-effects of default exposure windows can be annoying sometimes. For example, when intensity windows in bins or newbins have been specified, and it is difficult to evaluate a priori which fraction of bins and newbins will be accepted, one might end up with many newbins and/or intervals rejected by default exposure windows. Also when specifying time or phase windows, the default windows might need to be reset depending on what fraction of bins and newbins will actually be accepted.

If you do not want any exposure windows you can either create (with application win) and use a window file containing no exposure windows, or specify from a question/answer session that no exposure windows should be used.

Example:

 
This example shows how to run application `win` (interactively) to produce a
window file. User's input follow the `=>`prompt, if the replay is a blank the
default will be used.
Comments to the example are in between double exclamation marks.

$ win >>>> Program win 2-JUL-1992 18:39:42.42 Xronos vers. 3.00 Jul 92

win> Read window file ? y/n[n]=> win> Enter windows ? y/n[y]=> y win> Time windows ? y/n[n]=> y win> Format for time windows 1=d / 2=d s / 3=d h m s ms [1]=> 3 win> Enter up to 100 time ordered windows( - to exit) win> Window 1 start[ 0 0 0 0 0]=> 359 19 win> Window 1 stop [ 0 0 0 0 0]=> 359 21 35 40 312 win> Window 2 start[ 0 0 0 0 0]=> 359 18 40 52 870 xrinerr> Error: windows are not ordered !! note wrong reply !! win> Window 2 start[ 0 0 0 0 0]=> 359 22 40 52 870 win> Window 2 stop [ 0 0 0 0 0]=> 361 win> Window 3 start[ 0 0 0 0 0]=> xrinerr> Error: windows are not ordered !! to exit a - must be entered !! win> Window 3 start[ 0 0 0 0 0]=> - win> Phase windows ? y/n[n]=> y win> Format for epoch 1=d / 2=d s / 3=d h m s ms [1]=> 1 win> Epoch [ 0.00000000]=> 359.02545 win> Format for period 1=d / 2=s[2]=> 1 win> Period [ 0.00000000E+00]=> .027789941 win> Enter up to 10 phase windows (- to exit) !! Note phase order !! win> Phase wind. 1 start 0->1[0.0000]=> .1 win> Phase wind. 1 stop 0->1[0.0000]=> .36 win> Phase wind. 2 start 0->1[0.0000]=> .46 win> Phase wind. 2 stop 0->1[0.0000]=> .94 win> Phase wind. 3 start 0->1[0.0000]=> -

win> Intensity windows ? y/n[n]=> y win> How many time series ? 1/2/3[1]=> 2 !! i.e. for series A and B !! win> Series A: intensity windows in Orig. Bins? y/n[n]=> y win> Enter up to 10 ints ordered windows for Orig. Bins in series A (- to exit) win> Ints. wind. 1 min(c/s)[ 0.000E+00]=> win> Ints. wind. 1 max(c/s)[ 0.000E+00]=> 300. win> Ints. wind. 2 min(c/s)[ 0.000E+00]=> - win> Series A: intensity windows in New Bins ? y/n[n]=> y win> Enter up to 10 ints ordered windows for New Bins in series A (- to exit) win> Ints. wind. 1 min(c/s)[ 0.000E+00]=> 5. win> Ints. wind. 1 max(c/s)[ 0.000E+00]=> 200. win> Ints. wind. 2 min(c/s)[ 0.000E+00]=> 400. win> Ints. wind. 2 max(c/s)[ 0.000E+00]=> 500. win> Ints. wind. 3 min(c/s)[ 0.000E+00]=> - win> Series A: intensity windows in Intervals ? y/n[n]=> y win> Enter up to 10 ints ordered windows for Intervals in series A (- to exit) win> Ints. wind. 1 min(c/s)[ 0.000E+00]=> 200. win> Ints. wind. 1 max(c/s)[ 0.000E+00]=> 500. win> Ints. wind. 2 min(c/s)[ 0.000E+00]=> -

win> Series B: intensity windows in Orig. Bins? y/n[n]=> n win> Series B: intensity windows in New Bins ? y/n[n]=> win> Series B: intensity windows in Intervals ? y/n[n]=> y win> Enter up to 10 ints ordered windows for Intervals in series B (- to exit) win> Ints. wind. 1 min(c/s)[ 0.000E+00]=> 150. win> Ints. wind. 1 max(c/s)[ 0.000E+00]=> 300. win> Ints. wind. 2 min(c/s)[ 0.000E+00]=> - win> Exposure windows ? y/n[y]=> y win> Keep default expos. winds?y/n[y]=> y win> Write window file ? y/n[y]=> win> Window filename [.wi]=> example_a_win Written window file example_a_win.wi !! note filename extension appended by the program !! >>>> Program win 2-JUL-1992 18:45:22.67 Normal termination

Next: QDP/PLT Up: Windows Previous: Special Newbin Windows

Lorella Angelini
Thu 12 Oct 16:35:19 1995