pro sox_prep2, fdir,index_save
;+
; NAME:
;       SOX_PREP2
; PURPOSE:
;	Create Level1 dataset 
; EXPLANATION:
;	Read Level0 dataset and calibrate wavelengths and sensitivities of
;	the SOX instruments.
; CALLING SEQUENCE:
;	SOX_PREP2, fdir, index_save
; INPUTS:
;	fdir:          level0_file containing directory and file name (fdir-0.sav) &
;                      level1_file containing directory and file name (fdir-1.sav)
;	index_save =0: start creating cmax1.sav, which contains shift bin numbers
;		       of spectra to adjust wavelength scale.
;		   =1: for confirmation and modification of shift bin numbers.
;		   =2: create level-1 database.
; MODIFICATION HISTORY:
;	8-Mar-2020  TW - Version 1.0