[求助] 代码中的T1,T2,T3各代表什么？

       Program GetBeta
       DIMENSION  MIU(3), ALPHA(6), BETA(10)
       REAL MIU, ALPHA, BETA, MIU0, ALPHA0, BETAX, BETAY, BETAZ,BETA0
       CHARACTER T1*20, T2*20, T3*20
       OPEN (UNIT=1, FILE='data.tmp', STATUS='OLD' )
       READ(1,50) T1
       READ(1,100) ( MIU(I),I=1,3)
       READ(1,50) T2
       READ(1,100) ( ALPHA(I),I=1,6)
       READ(1,50) T3
       READ(1,100) ( BETA(I),I=1,10)
       CLOSE(1)
50     FORMAT(A20)
100    FORMAT(5(1X,E15.8E2))
       MIU0=SQRT(MIU(1)*MIU(1)+MIU(2)*MIU(2)+MIU(3)*MIU(3))
       ALPHA0=(ALPHA(1)+ALPHA(3)+ALPHA(6))/3.0
       BETAX=(BETA(1)+BETA(3)+BETA(8))*0.6
       BETAY=(BETA(2)+BETA(4)+BETA(9))*0.6
       BETAZ=(BETA(5)+BETA(7)+BETA(10))*0.6
       BETA0=SQRT(BETAX*BETAX+BETAY*BETAY+BETAZ*BETAZ)
C       WRITE(*,200) ( MIU(I),I=1,3)
       WRITE(*,50) T1
       WRITE(*,200) MIU0
       WRITE(*,*) '================='
C       WRITE(*,200) ( ALPHA(I),I=1,6)
       WRITE(*,50) T2
       WRITE(*,200) ALPHA0
       WRITE(*,*) '================='
C       WRITE(*,200) ( BETA(I),I=1,10)
       WRITE(*,50) T3
       WRITE(*,200) BETA0
200    FORMAT(1X,E15.8E2)
       END