Missing negative values in 2D projection

Flair
1

Versions

Please provide the used software versions.

FLUKA: 4-5.2
Flair: 3.4-5.4
Operating system: Ubuntu 24.04 LTS

Description

I am trying to understand charge flow via a NET-CHRG usrbin, but a 2D projection shows values of 0 where the most action should happen (Z=570-590, y = ±2.5-3.0).

mysterious_zero_at_impact
mysterious_zero_at_impact640×480 21.8 KB

when I try to get the 1Dmin and 1Dmax, negative values appear to be there

1Dmax_z
1Dmax_z640×480 23 KB

1Dmin_z
1Dmin_z640×480 15.3 KB

but a 2D(Z) projection at the most negative peak shows a minimum of 0.

2Dprojection_missing_negative_values
2Dprojection_missing_negative_values640×480 23.6 KB

It seems the negative values are lost somewhere in the post-processing.

Input files

data in question:
protons_hloss_22.bnn.txt (1.5 MB)

Best regards
Roman

2

Dear Roman,

Thank you very much for reporting the issue.

Until it is fixed (or instead of the standard plotting) you can plot correctly the negative charge values on the Gemometry tab using a Layer.

Furthermore if you set the Palette color to diff instead of fluka, you can easily distinguish the negative and positive values (in case the min and max of the palette are set to have the same absolute value).

Cheers,
David