4.1.2.1 Objectives of spectral resolution measurements

1.

Determine energy scale to 0.1%, FWHM to $\sim 5\%$.

2.

Determine off-peak features (Si K escape, Si-K fluorescent) to $0.3\%$ of total flux.

3.

Determine magnitude of low-energy tail at level of $\sim0.5\%$ of main peak (integrated tail area : integrated main peak area).