Saturation buildup time experiments for SPIKE protein system.  No ligand is added.

Experiments 100 - 140 are for saturation times 1s - 5s
Experiments 200 - 290 are for saturation times 0.1s - 1.9s

For each, experiment 100, 110, 120, etc correspond to saturation times of 1 second, 2 s, 3 s etc up
to the maximum of 5 s where saturation time = relaxation delay.
The spacing is similar for 200, 210, 210 corresponding to 0.1s, 0.3s, 0.5s, etc

For each saturation time e.g 110, experiment numbers 111 and 112 are the off resonance and difference
spectra extracted from the pseudo 2D experiment 110.
