```    Program g01sbfe
!     G01SBF Example Program Text

!     Mark 26.2 Release. NAG Copyright 2017.

!     .. Use Statements ..
Use nag_library, Only: g01sbf, nag_wp
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
Integer                          :: i, ifail, ldf, lout, lt, ltail
!     .. Local Arrays ..
Real (Kind=nag_wp), Allocatable  :: df(:), p(:), t(:)
Integer, Allocatable             :: ivalid(:)
Character (1), Allocatable       :: tail(:)
!     .. Intrinsic Procedures ..
Intrinsic                        :: max, mod, repeat
!     .. Executable Statements ..
Write (nout,*) 'G01SBF Example Program Results'
Write (nout,*)

!     Skip heading in data file

!     Read in the input vectors
Allocate (tail(ltail))

Allocate (t(lt))

Allocate (df(ldf))

!     Allocate memory for output
lout = max(lt,ldf,ltail)
Allocate (p(lout),ivalid(lout))

!     Calculate probability
ifail = -1
Call g01sbf(ltail,tail,lt,t,ldf,df,p,ivalid,ifail)

If (ifail==0 .Or. ifail==1) Then
!       Display titles
Write (nout,*) '   TAIL      T        DF        P      IVALID'
Write (nout,*) repeat('-',47)

!       Display results
Do i = 1, lout
Write (nout,99999) tail(mod(i-1,ltail)+1), t(mod(i-1,lt)+1),         &
df(mod(i-1,ldf)+1), p(i), ivalid(i)
End Do
End If

99999 Format (5X,A1,2(4X,F6.2),4X,F6.3,4X,I3)
End Program g01sbfe
```