Hello,
I suppose, by the variable name you stated, that you are using BlueKenue for visualization of results, am I correct?
BlueKenue identifies pairs of variables with the same name, bu along different axes (Radiation Stress SX[X and Y]) and creates a vector field with them (Radiation Stress SXXY).
One thing you can do, if you really need to use BkueKenue, is to use its builtin calculator and convert the vector field to two scalar fields.
But, I discourage you to do that. My suggestion is to use another software that can open the Selafin files (Matlab, Python, etc.). In these softwares, the components SXX and SXY will be separated.
Best Regards,
Phelype