How to determine the VTOC and VTOCIX size and location using IEHLIST LISTVTOC command

//STEP1  EXEC PGM=IEHLIST 

//SYSPRINT DD SYSOUT=A 

//DD1   DD UNIT=3390,VOLUME=SER=volser,DISP=OLD 

//SYSIN  DD * 

  LISTVTOC  FORMAT,VOL=3390=volser,INDEXDSN=SYS1.VTOCIX.volser 

/* 

View the output from the IEHLIST job. The following sections display the sizes and locations of the VTOC and VTOCIX.

The FORMAT 4 section describes information pertaining to the VTOC. The size of the VTOC is the difference between the high and the low cylinders labeled LOW(C-H) HIGH(C-H)

FORMAT 4 DSCB NO AVAIL/MAX DSCB /MAX DIRECT  NO AVAIL  NEXT ALT   FORMAT 6  LAST FMT 1     VTOC EXTENT        THIS DSCB  
          VI   DSCBS   PER TRK  BLK PER TRK  ALT TRK   TRK(C-H)   (C-H-R)   DSCB(C-H-R)/LOW(C-H) HIGH(C-H)    (C-H-R)    
          81   20540       50         45         0         0  0             61  14  50    2   0    61  14     2   0   1  
         NUMBER OF   MULTICYLINDER UNITS                                                                                 
         CYLINDERS   FIRST CYL ADDR  SPACE                                                                               
             70119          65520      21                                                                                

The VTOCIX section describes information pertaining to the VTOCIX. The size of the VTOCIX is the difference between the high and the low cylinders labeled LOW(C-H) HIGH(C-H)

SYS1.VTOCIX.ZSSMS9                            ZSSMS9      1  2019.295    00.000    00.000    1  PS   F      00     8192  
SMS.IND   LRECL  KEYLEN  INITIAL ALLOC  2ND ALLOC    EXTEND       LAST BLK(T-R-L)  DIR.REM  F2 OR F3(C-H-R)  DSCB(C-H-R) 
SU         8192            TRKS CONTIG        0                       899   6     0                            2   0   3 
EATTR                                                                                                                    
NS                                                                                                                       
            EXTENTS  NO  LOW(C-H)   HIGH(C-H)                                                                            
                       0   121  0      180 14