heatmap with OCF color scale centered at 0 with fixed range -3500 to 3500

[ram-from-tvl]

Pull Request

Description

• Replaced the default heatmap colors with a custom OCF color scale using the provided colors: #4675c1, #65b0c9, #58b0a9, #ffd480, #faa056, #9cb6e1, #a3d6e0, #9ed1cd, #ffe9bc, #ffdabc
• Set zmid=0 to center the scale around zero, making it easier to compare positive and negative values
• Fixed the scale range with zmin=-3500 and zmax=3500 as suggested in the issue, ensuring consistent color intensity for values in this range

Fixes #376

Checklist:

• My code follows OCF's coding style guidelines
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation

[ram-from-tvl]

Hi @peterdudfield
Please let me know if these changes are good to go.
Thank you!

[ram-from-tvl]

[ram-from-tvl]

Hi @peterdudfield
please let me know if this colorscale looks good or if any changes are required.
Thank you!

[peterdudfield]

Hi @peterdudfield please let me know if this colorscale looks good or if any changes are required. Thank you!

It looks like you have one run of bold colours, then another run of light colours. Could you actually just use the bold colours for the full scale? Other 0 colours is very similar to 3500 which could be confusing.