Plotting 2D contours using .txt or .dat file

[timothee.chabat (Timothee Chabat (Kitware))]

is your issue similar to these ones ? Please take a look at the proposed answers

2D contour from .csv

OK. What you are describing is not actually contours but rather the coloring of a flat surface. So the first think you need to do is change how you are using Table To Points to generate a flat surface rather than the raised surface. (You are actually making a 3D surface plot, which is useful in its own right, but not what you are asking for.) To do this, turn on the 2D Points option on the Table To Points filter. The Z Column options will then be ignored and all the points will be placed in the …

2D contour from csv with values at array nodes

Your data is not correctly formated to be read into paraview. it should be like that: val00 val01 val01 ... val09 val10 val11 ... val98 val99