# Data format¶

## FID or ser file¶

For reconstruction, NESTA-NMR requires only the NUS NMR data and the
sampling schedule used during data acquisition. The NUS data should be
collected so that real and imaginary (complex) pairs are adjacent to
each other in the indirect dimension for each NUS point. The data will
contain 2^{N} times as many FIDs as NUS points due to the complex
pairs. For example, a 4D data set should contain eight FIDs for each NUS
point: (R,R,R), (I,R,R), (R,I,R), (I,I,R),(R,R,I), (I,R,I), (R,I,I),
(I,I,I) where R and I denote the real and imaginary part of each of the
indirect dimensions (t_{1}, t_{2}, t_{3}). As
of TopSpin 3.0, this is the default acquisition mode for NUS data.

## Sampling schedule¶

The NUS sampling schedule, called a `nuslist`

by Bruker, is a text
file whose rows correspond to consecutively acquired NUS points. Each
row contains space-delimited integers corresponding to a multiple of the
respective dwell time for each indirect dimension. The first ten lines
of a sampling schedule for a 4D NUS acquisition are as such:

```
0 0 0
3 0 0
1 0 0
1 1 0
0 0 5
2 0 0
1 0 2
3 0 1
2 1 3
6 0 2
```