# Calculate χ^{2} for your own experimental data.

The datafile you submit must be in the format as given in the following example:

NP 3 0.10 29.6 60.0 'PB' 0.0789 0.0200 29.6 90.0 'PB' 0.0824 0.0066 29.6 120.0 'PB' 0.0521 0.0100 5 0.06 30.0 60.4 'AYY' 0.251 0.012 30.0 75.5 'AYY' 0.222 0.017 30.0 90.5 'AYY' 0.262 0.016 30.0 105.5 'AYY' 0.247 0.015 30.0 120.5 'AYY' 0.164 0.010

The first line gives in a 2 character string (capitals!) the reaction:
`PP` or `NP`

Then follow the data in **groups**; a **group**
of data consist of data that all have the same normalization uncertainty
in common.

The first line of a group of data consists of 2 numbers: first the number of data that follow and second the normalization uncertainty. (In the example: the first group consists of 3 data and have a 10 percent normalization uncertainty). Use 0.0 for the normalization uncertainty if your data are absolutely normalized,choose 2000.0 if your data are not normalized.

Next follow the data in the group; each line has 5 entries:

- The lab-energy T
_{lab}in MeV - The CM scattering angle in degrees; if your data are total cross-sections use 0.0
- The observable enclosed in a pair of apostrophes, in capitals
- The experimental value
- The experimental uncertainty

The maximum number of data that can be handled at the same time is approximately 2000, but the more you submit - the longer it will take to perform the calculations, especially for pp-scattering (and to upload your file and to download the results!)

If you have any requests, comments or questions about this program please contact us!