Been pondering and researching over these for days

I thought maybe it's just a linear interpolate but I wonder why the values are offset by 1-6 o.O

I can produce more data if anyone requests

fades from red(ff0000) to blue (0000ff)
Code:
#ff0000
#0000ff

<#ff0000>1</>    255,0,0

<#ff0000>1</>    255,0,0
<#0100fd>2</>    1,0,253

<#ff0000>1</>    255,0,0
<#81007d>2</>    129,0,125
<#0100fd>3</>    1,0,253

<#ff0000>1</>    255,0,0
<#ab0053>2</>    171,0,83
<#5700a7>3</>    87,0,167
<#0100fd>4</>    1,0,253

<#ff0000>1</>    255,0,0
<#c1003d>2</>    193,0,61
<#81007d>3</>    129,0,125
<#4100bd>4</>    65,0,189
<#0100fd>5</>    1,0,253

<#ff0000>1</>    255,0,0
<#cd0031>2</>    205,0,49
<#9b0063>3</>    155,0,99
<#670097>4</>    103,0,151
<#3500c9>5</>    53,0,201
<#0100fd>6</>    1,0,253

<#ff0000>1</>    255,0,0
<#d50029>2</>    213,0,41
<#ab0053>3</>    171,0,83
<#81007d>4</>    129,0,125
<#5700a7>5</>    87,0,167
<#2d00d1>6</>    45,0,209
<#0100fd>7</>    1,0,253    

<#ff0000>1</>    255,0,0
<#db0023>2</>    219,0,35
<#b70047>3</>    183,0,71
<#93006b>4</>    147,0,107
<#6f008f>5</>    111,0,143
<#4b00b3>6</>    75,0,179
<#2700d7>7</>    39,0,215
<#0100fd>8</>    1,0,253

<#ff0000>1</>    255,0,0
<#e1001d>2</>    225,0,29
<#c1003d>3</>    193,0,61
<#a1005d>4</>    161,0,93
<#81007d>5</>    129,0,125
<#61009d>6</>    97,0,157
<#4100bd>7</>    65,0,189
<#2100dd>8</>    33,0,221
<#0100fd>9</>    1,0,253
fades from red to green to blue

Code:
#ff0000
#00ff00
#0000ff

<color=#ff0000>1</>    255,0,0

<color=#ff0000>1</>    255,0,0
<color=#0003fb>2</>    0,3,251

<color=#ff0000>1</>    255,0,0
<color=#03fb00>2</>    3,251,0
<color=#0003fb>3</>    0,3,251

<color=#ff0000>1</>    255,0,0
<color=#57a700>2</>    87,167,0
<color=#00af4f>3</>    0,175,79
<color=#0003fb>4</>    0,3,251

<color=#ff0000>1</>    255,0,0
<color=#837b00>2</>    131,123,0
<color=#03fb00>3</>    3,251,0
<color=#00837b>4</>    0,131,123
<color=#0003fb>5</>    0,3,251

<color=#ff0000>1</>    255,0,0
<color=#9b6300>2</>    155,99,0
<color=#37c700>3</>    55,199,0
<color=#00cf2f>4</>    0,207,47
<color=#006b93>5</>    0,107,147
<color=#0003fb>6</>    0,3,251

<color=#ff0000>1</>    255,0,0
<color=#ab5300>2</>    171,83,0
<color=#57a700>3</>    87,167,0
<color=#03fb00>4</>    3,251,0
<color=#00af4f>5</>    0,175,79
<color=#005ba3>6</>    0,91,163
<color=#0003fb>7</>    0,3,251