Here is the updated 13-color palette with Neon Green replaced by a different contrasting color:

json
{
  "palette_name": "High Contrast Spectrum - Final Revision 4",
  "colors": [
    {
      "name": "Crimson Red",
      "hex_code": "
                            
                            #DC143C
                        "
    },
    {
      "name": "Deep Sky Blue",
      "hex_code": "
                            
                            #00BFFF
                        "
    },
    {
      "name": "Lime Green",
      "hex_code": "
                            
                            #32CD32
                        "
    },
    {
      "name": "Golden Yellow",
      "hex_code": "
                            
                            #FFD700
                        "
    },
    {
      "name": "Royal Purple",
      "hex_code": "
                            
                            #7851A9
                        "
    },
    {
      "name": "Coral Orange",
      "hex_code": "
                            
                            #FF7F50
                        "
    },
    {
      "name": "Slate Gray",
      "hex_code": "
                            
                            #708090
                        "
    },
    {
      "name": "Vivid Teal",
      "hex_code": "
                            
                            #008080
                        "
    },
    {
      "name": "Turquoise",
      "hex_code": "
                            
                            #40E0D0
                        "
    },
    {
      "name": "Electric Lime",
      "hex_code": "
                            
                            #CCFF00
                        "
    },
    {
      "name": "Bright Cyan",
      "hex_code": "
                            
                            #00FFFF
                        "
    },
    {
      "name": "Chocolate Brown",
      "hex_code": "
                            
                            #D2691E
                        "
    },
    {
      "name": "Light Coral",
      "hex_code": "
                            
                            #F08080
                        "
    }
  ]
}

In this version, Neon Green has been replaced with Bright Cyan, which adds a refreshing and vibrant touch to the palette. If you have any more modifications or specific applications in mind for this palette, just let me know!