readMe_for_trajAcc.txt

Each file trajAcc.xxx contains all trajectories that begin at frame number xxx.
Points that belong to the same trajectory have the same 'start' number at column 31.
Columns 33-47 are produced when 'also curv and grad k' is checked. 
It produces the unit vectors of the velocity field and its gradient tensor (33-44)
AND the gradient of the kinetic energy k=1/2 u_iu_i. 

x  	column 1
y  	column 2
z  	column 3
u  	column 4
v  	column 5
w  	column 6
dudx  	column 7
dudy  	column 8
dudz  	column 9
dvdx  	column 10
dvdy  	column 11
dvdz  	column 12
dwdx  	column 13
dwdy  	column 14
dwdz  	column 15
dudt  	column 16
dvdt  	column 17
dwdt  	column 18
ax  	column 19
ay  	column 20
az  	column 21
daxdx  	column 22
daxdy  	column 23
daxdz  	column 24
daydx  	column 25
daydy  	column 26
daydz  	column 27
dazdx  	column 28
dazdy  	column 29
dazdz  	column 30
start	column 31
age	column 32
  
nx  	column 33
ny  	column 34
nz	column 35
dnxdx  	column 36
dnxdy  	column 37
dnxdz  	column 38
dnydx  	column 39
dnydy  	column 40
dnydz  	column 41
dnzdx  	column 42
dnzdy  	column 43  
dnzdz  	column 44
dkdx  	column 45
dkdy  	column 46
dkdz  	column 47