关于使用Grads画图时ctl文件的报错

Annosophy

Warning: Invalid TDEF syntax in L.ctl -- Changing size of T axis from 0 to 1

然后我的ctl文件是这样的：
dset ^L.dat
options  byteswapped
undef 1.e30
title  OUTPUT FROM *             PROGRAM:WRF/CHEM V3.8.1 MODEL
xdef   111 linear 0 0.0001
ydef    96 linear 0 0.0001
zdef   24 linear 1 1  
tdef    0 linear 12Z29DEC2016     180MN      
VARS    0
ENDVARS
@ global String comment TITLE =  OUTPUT FROM *             PROGRAM:WRF/CHEM V3.8.1 MODEL
@ global String comment START_DATE = 2016-12-19_12:00:00
@ global String comment SIMULATION_START_DATE = 2016-12-19_12:00:00
@ global String comment WEST-EAST_GRID_DIMENSION =   112
@ global String comment SOUTH-NORTH_GRID_DIMENSION =    97
@ global String comment BOTTOM-TOP_GRID_DIMENSION =    30
@ global String comment DX =      3333.33
@ global String comment DY =      3333.33
@ global String comment SKEBS_ON =     0
@ global String comment SPEC_BDY_FINAL_MU =     1
@ global String comment USE_Q_DIABATIC =     0
...
但是我在ctl文件里找不到T axis这个选项，，有哪位聚聚可以帮助我一下吗