Data description:

01-position'x'.dat: Position of node 'x'. The data format is as follows:
	[# longitude]	[# latitude]

02-disperdion.dat: Isotropic dispersion curves. The data format is as follows:
	line1     : [# do love]     [# do rayleigh]
	line2     : [# number of data]
    line3~end : [# period] 	    [# velocity(km/s)] 	   [# uncertainty(km/s)]
	
03-anisotropy_cs.dat: Azimuthally anisotropic coefficients for phase velocity anomaly. 
					  The data is arranged in the same order as dispersion data. The data format is as follows:
	[# a_cos(m/s)]   [# a_sin(m/s)]   [# uncertainty for a_cos (m/s)]   [# uncertainty for a_sin (m/s)]

NOTICE: 
1. Because we only use the phase velocity for Rayleigh wave, the line 1 in dispersion file is always 'F T', i.e. 'False True'.
2. The uncertainty means the data uncertainty used in the inversion. 