[BUG] Wrong diffraction simulation

[Dirack]

🐛 Bug report

Describe the bug

Diffraction simulation is not working, the simulated hyperbolas are not generated correctly. It appears a black hyperbola in the stacked section, instead of the simulated hyperbola.

To Reproduce
Steps to reproduce the behavior:

1. Run the Velocity inversion experiment with the following data

section.tar.gz

sfin st.rsf 
st.rsf:
    in="stdin"
    esize=4 type=float form=native 
    n1=600         d1=0.004       o1=0.3        label1="Time" unit1="s" 
    n2=201         d2=0.025       o2=0          label2="CMP" unit2="Km" 
    n3=1           d3=0.025       o3=0          label3="CMP" unit3="Km" 
	120600 elements 482400 bytes

2. With this version of the diffraction simulation program https://github.com/Dirack/diffractionSimulator/tree/0271f0098a218367a35a921a8fbcf52e4613c7ae sfdiffsim.

3. The simulated hyperbolas will appear as the black image showed previously.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: Linux Ubuntu
• Version 19.04 Focal Fossa

Additional context