The headings are given in the first four rows. The first row gives the total number of records; the second row gives the column number (e.g. col1, col2, ... ), and the third and forth give  the name and unit of the varibles shown in the individual columns.

The following is one example.   
number of records = 559402
col 1       col 2       col 3       col 4       col 5       col 6       col 7       col 8       col 9       col 10       col 11       col 12       col 13       col 14       col 15       col 16       col 17       col 18       col 19       col 20
Time  Normalload          Pf           T       Displ         LPv       TauAB     Taucorr          Mu      Mucorr           h       hlvdt          Ec        Vsam       Vload        h/h0      strain    Instrpos        LVDT     Tauseal      
s         MPa         MPa           C          mm    micron/s         MPa         MPa          --          --      micron      micron      micron    micron/s    micron/s          --          --      micron      micron          kN       
## ##  

Normalload = normal stress
Pf = fluid pressure
T = temperature
Displ = displacement
LPV = load point velocity
TauAB = summation of shear stress from the torque couples
Taucorr = shear stress after correction of seal friction
Mu = friction of coefficient
Mucorr = Mu determined from Taucorr
h = thickness measured from the Instron position
hlvdt = thickness measured from a local LVDT 
Ec = elastic deformation of the apparatus
Vsam = sample slip velocity
Vload = load-point velocity
h/h0 = normal strain
strain = shear strain
Instrpos = position given by the Instron frame
LVDT = position indicated by the local LVDT 
Tauseal = seal resistence