File format is SINEX V2.0
fields:

%=TRO 9.99 [AC] xx:xxx:xxxxx [AC] xx:xxx:xxxxx xx:xxx:xxxxx R MIX 
+FILE/REFERENCE
 DESCRIPTION        IVS Troposphere
 OUTPUT             Tropospheric Estimates from 24 h session
 CONTACT            [name, email]
 SOFTWARE           [Calc Solve Vx.x, Occam 6.0 (lsm),...]
 INPUT              [NGScard, DataBase,...]
-FILE/REFERENCE
+SITE/ID
 ABCD    [Domesno.] R                        xxx xx  x.x  xx xx xx.x   xxx.x
-SITE/ID
+SITE/ECCENTRICITY
 ABCD       1 R 00:000:00000 00:000:00000 XYZ   0.0000   0.0000   0.0000
-SITE/ECCENTRICITY
+TROP/STA_COORDINATES
 ABCD       1 R xxxxxxxx.xxx xxxxxxxx.xxx  xxxxxxx.xxx [ITRFxx]   [AC]
-TROP/STA_COORDINATES
+TROP/DESCRIPTION
 SOLUTION_FIELDS_1             TROTOT  TROWET  STDDEV  GRN_APR GRE_APR
                               GRN_EST STDDEV  GRN_EST STDDEV 
*_______KEYWORD________ ___________GENERAL___________
 ELEVATION CUTOFF ANGLE                         [0-90]
 DOWNW. OF LOW OBSERV.                        [YES/NO]
 TERR. REFERENCE FRAME                  [ITRFxxxx,...]
 TRF FIXED                                    [YES/NO]
 DRY MAPPING FUNCTION         [VIENNA MF/NIELL MF,...]
 WET MAPPING FUNCTION         [VIENNA MF/NIELL MF,...]
*_______KEYWORD________ ________ZENITH DELAYS________
 SAMPLING ZENITH DELAYS                          [SEC]
 APRIORI HYDROST. DELAY                [MARINI 73,...]
 APRIORI WET DELAY                          [NONE,...]
 ZENITH DELAY MODEL[CONSTR. PIECEW. LINEAR FUNCT.,...]
 CONSTR. ZD OFFSET                          [NONE,...]
 CONSTR. ZD RATE                          [MM/SQRT(H)]
*_______KEYWORD________   __________GRADIENTS________
 SAMPLING GRADIENTS                              [SEC]
 APRIORI GRADIENTS                          [NONE,...]
 GRADIENT MODEL    [CONSTR. PIECEW. LINEAR FUNCT.,...]
 CONSTR. GR OFFSET                          [NONE,...]
 CONSTR. GR RATE                                  [MM]
-TROP/DESCRIPTION
+TROP/SOLUTION
*ABCDEFGH
*____________________  TROTOT  TROWET  STDDEV GRN_APR GRE_APR GRN_EST  STDDEV GRE_EST  STDDEV
 ABCD xx:xxx:xxxxx    xxxx.xx  xxx.xx  xxx.xx  xxx.xx  xxx.xx  xxx.xx  xxx.xx  xxx.xx  xxx.xx
-TROP/SOLUTION
%=ENDTRO