Nuclear Magnetic Resonance Study on Microstructure and Permeability of Coals of Different Ranks

Table 2

FID sequence parameters.

Parameter	Value
SW (kHz)	100
DRG	3
SF (MHz)	21
DR	1
O1 (Hz)	675098.01
NS	2
PRG	1
RG1 (dB)	10.0
RFD (ms)	0.002
TW (ms)	1500.000