Monochrome indigo to light violet gradient palette editor

/* https://grabient.com/_gNDgvwf4qgLhgtWgXggDCgBhgBkgJ0gH0gNb?style=angularSwatches&steps=8&angle=0 */

background: conic-gradient(from 0deg, #53277b 0.000deg, #53277b 45.000deg, #6c2a94 calc(45.000deg + 0.1deg), #6c2a94 90.000deg, #8932ac calc(90.000deg + 0.1deg), #8932ac 135.000deg, #a740c1 calc(135.000deg + 0.1deg), #a740c1 180.000deg, #c854d4 calc(180.000deg + 0.1deg), #c854d4 225.000deg, #e86ce4 calc(225.000deg + 0.1deg), #e86ce4 270.000deg, #ff8af1 calc(270.000deg + 0.1deg), #ff8af1 315.000deg, #ffadfb calc(315.000deg + 0.1deg) 360.000deg);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gNDgvwf4qgLhgtWgXggDCgBhgBkgJ0gH0gNb?style=angularSwatches&steps=8&angle=0 -->
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              <clipPath id="squareClip">
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              </clipPath>
              <filter id="antiGap">
                <feGaussianBlur in="SourceGraphic" stdDeviation="0.3" />
              </filter>
            </defs>
            <g clip-path="url(#squareClip)" filter="url(#antiGap)" shape-rendering="crispEdges">
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        </svg>

["#53277b", "#6c2a94", "#8932ac", "#a740c1", "#c854d4", "#e86ce4", "#ff8af1", "#ffadfb"]

// https://grabient.com/_gNDgvwf4qgLhgtWgXggDCgBhgBkgJ0gH0gNb?style=angularSwatches&steps=8&angle=0
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 8.0;
const float ANGLE = 0.0;

vec3 palette(float t) {
    vec3 a = vec3(0.835, 3.056, -0.470);
    vec3 b = vec3(0.737, 2.902, 1.504);
    vec3 c = vec3(0.194, 0.097, 0.100);
    vec3 d = vec3(0.628, 0.500, 0.859);
    return a + b * cos(6.283185 * (c * t + d));
}

// N hard swatches sampled from the palette
vec3 stops(float t) {
    float i = min(floor(clamp(t, 0.0, 1.0) * STEPS), STEPS - 1.0);
    return palette(i / (STEPS - 1.0));
}

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    vec2 p = fragCoord - 0.5 * iResolution.xy;
    // conic from ANGLE, clockwise from top (CSS convention)
    float t = fract((atan(p.x, p.y) - radians(ANGLE)) / 6.283185);
    fragColor = vec4(stops(t), 1.0);
}

[
  [0.835, 3.056, -0.470],
  [0.737, 2.902, 1.504],
  [0.194, 0.097, 0.100],
  [0.628, 0.500, 0.859]
]