Dear Qi Ding,
this can be done in 2 steps:
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Do the 1D Projection in the USRBIN plot. This will create a .dat file with the name of the plot. (In your case 1112_52_plot.dat)
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Then you can use this .dat file in a USR-1D plot to superimpose multiple projections.
Note: You need to replot the projection in the first step every time when you run a new simulation to update the .dat file.
Cheers,
David
P.S.:
It seems that you are using a Flair version that is not supported on this forum. Please install the latest version of FLUKA and Flair from: