Syntax:

-chi2bin Nbin bintime1...bintimeN

Example 1.
$ ./vartools -header -l EXAMPLES/lc_list \
    -chi2bin 5 5.0 10.0 60.0 1440 14400

#Name Chi2Bin_5.0_0 Weight_Mean_Mag_Bin_5.0_0 Chi2Bin_10.0_0 Weight_Mean_Mag_Bin_10.0_0 Chi2Bin_60.0_0 Weight_Mean_Mag_Bin_60.0_0 \
      Chi2Bin_1440.0_0 Weight_Mean_Mag_Bin_1440.0_0 Chi2Bin_14400.0_0 Weight_Mean_Mag_Bin_14400.0_0
EXAMPLES/1 228254.48109  10.23970 405745.83067  10.23903 1619850.72683  10.23607 6446329.92664  10.20336 14569840.53581  10.20009
EXAMPLES/2  10710.26878  10.10721  19525.73651  10.10720  82101.02128  10.10680 172928.13393  10.10747  15967.17229  10.11131
EXAMPLES/3     49.89202  10.16683     65.41749  10.16684    151.04489  10.16681    297.75291  10.16657    395.88712  10.16666
EXAMPLES/4     15.04175  10.35126     23.17347  10.35126     74.10398  10.35130    247.44014  10.35135    164.13887  10.35133
EXAMPLES/5     23.59164  10.43913     37.11690  10.43911    128.16520  10.43912    350.68371  10.43902    402.40959  10.43918
EXAMPLES/6     10.03222  10.52737     15.47193  10.52737     41.62336  10.52735     78.01005  10.52738     75.62758  10.52748
EXAMPLES/7     21.01770  10.56942     28.78196  10.56942     55.11081  10.56944     37.05850  10.56945     10.66248  10.56953
EXAMPLES/8     11.74891  10.61119     19.46837  10.61119     75.72787  10.61118    235.99781  10.61118     89.56209  10.61117
EXAMPLES/9      5.60637  10.73120      7.84047  10.73120     22.83600  10.73119     54.28169  10.73115     42.56913  10.73126
EXAMPLES/10      8.95585  10.87751     13.58515  10.87751     36.27533  10.87748     73.19929  10.87747     82.72547  10.87762

Apply a set of moving-mean filters to the light curves in the list EXAMPLES/lc_list and calculate chi^2 per degree of freedom and the weighted mean magnitude for each filter. We use 5 filters of 5.0, 10.0, 60.0, 1440.0, and 14400.0 minutes. Note that the "filter" here refers to replacing each point in the light curve with the mean of all points that are within the specified number of minutes of that point. The formal errors are decreased by the amount expected for white noise, as a result the chi2 values for the light curves in this example (which have non-negligible red-noise) increase as the filter-size is increased.