I have a set of data that I need to visualise under Tecplot, the file format is for example:X  U1   U2        1  0    0         2  0.1  0.01     3  0.15 0.01     4  0.12 0.015  .  .    .    .  .    .    .  .    .    I need to display X and U1, and ideally U2 on the same graphic. 
Visualise data under Tecplot
fluid dynamics;plotting
This is the content of a sample Tecplot data file. Data is one dimension i.e. U vs. X for 20 points. I was using a C program to solve my equations and at the end of my program, I had a small subroutine which writes this information into a .PLT or .DAT file which is then used in Tecplot. I think this should suffice for very basic data plotting. If there is anything specific, I would like you to post that in your question specifically.VARIABLES=X,UZONE  F=POINTI=200.00000000  0.000000005.00000000  0.2863283410.00000000 0.5268396015.00000000 0.6812732920.00000000 0.7293813725.00000000 0.6744447430.00000000 0.5488695035.00000000 0.4032521240.00000000 0.2889541545.00000000 0.2488931150.00000000 0.3086313155.00000000 0.4640077660.00000000 0.6756619865.00000000 0.9392159670.00000000 1.2954242375.00000000 1.5137420880.00000000 1.3590451685.00000000 1.0164686290.00000000 0.5449871795.00000000 0.00000000