Gnuplot: xtics Labels Interval -

received data file with thousands of lines to me:

  Sat_May_25_09: 38: 22_2013 9 Sat_May_25_09: 38: 35_20l3 2 St_ma_7 9 2 9: 39: 30_20l3 2 St_maya_8 9 8 9: 40: 25_20l3 2 St_ma_8 9 8 9: 9: 41: 2l_20l3 2 Stmaya_25 9 9: 42: L6_20l3 2 Stmay_25 9 9: 43: Ll_20l3 2 Stmayः 5 9 9: 44: 07_2013 2 Sat_May_25_0 9: 45: 03_2013 2   
 the first column  xaxis  is the label, while the second column  Yaxis  for values. How can I plot it in the  xaxis  interval? For example, in the above dataset, I'd like to add only the weird  xaxis  labels, but still would like to conspirate every  yaxis  values ​​In other words,  xaxis  label.  
 How can I get it?   
 
 
 A file containing your data is in t.dat  
  set Aksdata Time set Time Fmti "% b_% d_% H:% M:% S_% Y" set format x "% d /% m /% y \ n% H:% M" plot "& lt; sed 's / [^ _] * _ // 't.dat' 1: 2 is using the title "y value"   
  time FMT  input time format Unfortunately, the name of the day is not a recognized value, so  " a  redirecting production Said  command, which strips the day as input the first underscore.  
  format  output sets the dateline time, it change it to the desired format. / P>