Catalogs of SBLAs identified within each sample
crossref_specblocinfo.dat:
        - ispec (matches to absorber catalog)
        - thingid (thingid of spectra ispec)
        - zem (quasar redshift of spectra ispec)


lya_pixel_markers_nsig-100_-0.050-0.050_3_1_rebin.dat - SBLAs with -0.05 < Flux_lya < 0.05
lya_pixel_markers_nsig-100_0.050-0.150_3_1_rebin.dat  - SBLAs with  0.05 < Flux_lya < 0.15
lya_pixel_markers_nsig-100_0.150-0.250_3_1_rebin.dat  - SBLAs with  0.15 < Flux_lya < 0.25
columns:
	ispec - spectra number (for cross match to crossref_specblocinfo)
	fluxlya - flux of SBLA absorber
	wavlya - observed wavelength of SBLA absorber
	pixel - pixel of SBLA absorber
	0 - Unused column (preserved for backwards compatibility)
	snr - S/N in Lya Forest 


lya_pixel_markers_purity0.15_rebin.dat - SBLAs with purity > 15%
Columns:
	ispec - spectra number (for cross match to crossref_specblocinfo)
	fluxlya - flux of SBLA absorber
	wavlya - observed wavelength of SBLA absorber
	pixel - pixel of SBLA absorber
	snr_report -  S/N in Lya Forest 
	purityvalue - similated purity of SBLA
	thingid - SDSS thingid
	plate -SDSS plateid
	mjd - SDSS mjd
	fiber -SDSS fiber
	ra - RA (J2000)
	dec - DEC (J2000)