PAD Charts
All charts/Chord, arc & parallel

Thirty-two cars, six measures

parallel: an axis per measure, a line per car, coloured by origin.

1 The data _data/cars.json json 
[
  { "model": "Chevrolet Chevelle",   "origin": "USA",    "mpg": 18,   "cylinders": 8, "horsepower": 130, "weight": 3504, "acceleration": 12,   "year": 70 },
  { "model": "Ford Torino",          "origin": "USA",    "mpg": 17,   "cylinders": 8, "horsepower": 140, "weight": 3449, "acceleration": 10.5, "year": 70 },
  { "model": "Plymouth Fury III",    "origin": "USA",    "mpg": 14,   "cylinders": 8, "horsepower": 215, "weight": 4312, "acceleration": 8.5,  "year": 70 },
  { "model": "Toyota Corona",        "origin": "Japan",  "mpg": 24,   "cylinders": 4, "horsepower": 95,  "weight": 2372, "acceleration": 15,   "year": 70 },
  { "model": "Volkswagen 1131",      "origin": "Europe", "mpg": 26,   "cylinders": 4, "horsepower": 46,  "weight": 1835, "acceleration": 20.5, "year": 70 },
  { "model": "Peugeot 504",          "origin": "Europe", "mpg": 25,   "cylinders": 4, "horsepower": 87,  "weight": 2672, "acceleration": 17.5, "year": 70 },
  { "model": "Datsun PL510",         "origin": "Japan",  "mpg": 27,   "cylinders": 4, "horsepower": 88,  "weight": 2130, "acceleration": 14.5, "year": 71 },
  { "model": "AMC Gremlin",          "origin": "USA",    "mpg": 19,   "cylinders": 6, "horsepower": 100, "weight": 2634, "acceleration": 13,   "year": 71 },
  { "model": "Ford Pinto",           "origin": "USA",    "mpg": 25,   "cylinders": 4, "horsepower": 86,  "weight": 2226, "acceleration": 16.5, "year": 71 },
  { "model": "Fiat 124B",            "origin": "Europe", "mpg": 30,   "cylinders": 4, "horsepower": 76,  "weight": 2065, "acceleration": 14.5, "year": 71 },
  { "model": "Mazda RX2 Coupe",      "origin": "Japan",  "mpg": 19,   "cylinders": 3, "horsepower": 97,  "weight": 2330, "acceleration": 13.5, "year": 72 },
  { "model": "Volvo 145e",           "origin": "Europe", "mpg": 18,   "cylinders": 4, "horsepower": 112, "weight": 2933, "acceleration": 14.5, "year": 72 },
  { "model": "Buick Century 350",    "origin": "USA",    "mpg": 13,   "cylinders": 8, "horsepower": 175, "weight": 4100, "acceleration": 13,   "year": 73 },
  { "model": "Toyota Corolla 1200",  "origin": "Japan",  "mpg": 31,   "cylinders": 4, "horsepower": 65,  "weight": 1773, "acceleration": 19,   "year": 71 },
  { "model": "Audi 100LS",           "origin": "Europe", "mpg": 23,   "cylinders": 4, "horsepower": 91,  "weight": 2582, "acceleration": 14,   "year": 73 },
  { "model": "Dodge Dart Custom",    "origin": "USA",    "mpg": 15,   "cylinders": 8, "horsepower": 150, "weight": 3399, "acceleration": 11,   "year": 73 },
  { "model": "Honda Civic",          "origin": "Japan",  "mpg": 24,   "cylinders": 4, "horsepower": 97,  "weight": 2489, "acceleration": 15,   "year": 74 },
  { "model": "Ford Maverick",        "origin": "USA",    "mpg": 21,   "cylinders": 6, "horsepower": 72,  "weight": 3158, "acceleration": 19.5, "year": 75 },
  { "model": "Renault 12TL",         "origin": "Europe", "mpg": 27,   "cylinders": 4, "horsepower": 75,  "weight": 2155, "acceleration": 14.5, "year": 76 },
  { "model": "Chevrolet Caprice",    "origin": "USA",    "mpg": 17.5, "cylinders": 8, "horsepower": 145, "weight": 4140, "acceleration": 13.7, "year": 77 },
  { "model": "Datsun 200SX",         "origin": "Japan",  "mpg": 23.9, "cylinders": 4, "horsepower": 97,  "weight": 2405, "acceleration": 14.9, "year": 78 },
  { "model": "Saab 99GLE",           "origin": "Europe", "mpg": 21.6, "cylinders": 4, "horsepower": 115, "weight": 2795, "acceleration": 15.7, "year": 78 },
  { "model": "Pontiac Phoenix",      "origin": "USA",    "mpg": 33.5, "cylinders": 4, "horsepower": 88,  "weight": 2556, "acceleration": 13.6, "year": 78 },
  { "model": "Mercedes-Benz 300D",   "origin": "Europe", "mpg": 25.4, "cylinders": 5, "horsepower": 77,  "weight": 3530, "acceleration": 20.1, "year": 79 },
  { "model": "Oldsmobile Cutlass",   "origin": "USA",    "mpg": 23.9, "cylinders": 8, "horsepower": 90,  "weight": 3420, "acceleration": 22.2, "year": 79 },
  { "model": "Mazda GLC",            "origin": "Japan",  "mpg": 46.6, "cylinders": 4, "horsepower": 65,  "weight": 2110, "acceleration": 17.9, "year": 80 },
  { "model": "VW Rabbit Diesel",     "origin": "Europe", "mpg": 44.3, "cylinders": 4, "horsepower": 48,  "weight": 2085, "acceleration": 21.7, "year": 80 },
  { "model": "Toyota Cressida",      "origin": "Japan",  "mpg": 25.4, "cylinders": 6, "horsepower": 116, "weight": 2900, "acceleration": 12.6, "year": 81 },
  { "model": "Buick Skylark",        "origin": "USA",    "mpg": 26.6, "cylinders": 4, "horsepower": 84,  "weight": 2635, "acceleration": 16.4, "year": 81 },
  { "model": "Honda Accord",         "origin": "Japan",  "mpg": 36,   "cylinders": 4, "horsepower": 88,  "weight": 2160, "acceleration": 14.5, "year": 82 },
  { "model": "Ford Ranger",          "origin": "USA",    "mpg": 28,   "cylinders": 4, "horsepower": 79,  "weight": 2625, "acceleration": 18.6, "year": 82 },
  { "model": "Peugeot 505S Turbo",   "origin": "Europe", "mpg": 28.1, "cylinders": 4, "horsepower": 80,  "weight": 3230, "acceleration": 20.4, "year": 81 }
]
2 The chart tag relations/cars.pad pad 
{chart 'parallel', data='cars', label='model', value='mpg, cylinders, horsepower, weight, acceleration, year', color='origin', title='Thirty-two cars of the seventies, six measures each', width=680, height=400}
3 The result inline SVG · no JavaScript
Thirty-two cars of the seventies, six measures each Chevrolet Chevelle (USA): mpg 18, cylinders 8, horsepower 130, weight 3,504, acceleration 12, year 70; Ford Torino (USA): mpg 17, cylinders 8, horsepower 140, weight 3,449, acceleration 10.5, year 70; Plymouth Fury III (USA): mpg 14, cylinders 8, horsepower 215, weight 4,312, acceleration 8.5, year 70; Toyota Corona (Japan): mpg 24, cylinders 4, horsepower 95, weight 2,372, acceleration 15, year 70; Volkswagen 1131 (Europe): mpg 26, cylinders 4, horsepower 46, weight 1,835, acceleration 20.5, year 70; Peugeot 504 (Europe): mpg 25, cylinders 4, horsepower 87, weight 2,672, acceleration 17.5, year 70; Datsun PL510 (Japan): mpg 27, cylinders 4, horsepower 88, weight 2,130, acceleration 14.5, year 71; AMC Gremlin (USA): mpg 19, cylinders 6, horsepower 100, weight 2,634, acceleration 13, year 71; Ford Pinto (USA): mpg 25, cylinders 4, horsepower 86, weight 2,226, acceleration 16.5, year 71; Fiat 124B (Europe): mpg 30, cylinders 4, horsepower 76, weight 2,065, acceleration 14.5, year 71; Mazda RX2 Coupe (Japan): mpg 19, cylinders 3, horsepower 97, weight 2,330, acceleration 13.5, year 72; Volvo 145e (Europe): mpg 18, cylinders 4, horsepower 112, weight 2,933, acceleration 14.5, year 72; Buick Century 350 (USA): mpg 13, cylinders 8, horsepower 175, weight 4,100, acceleration 13, year 73; Toyota Corolla 1200 (Japan): mpg 31, cylinders 4, horsepower 65, weight 1,773, acceleration 19, year 71; Audi 100LS (Europe): mpg 23, cylinders 4, horsepower 91, weight 2,582, acceleration 14, year 73; Dodge Dart Custom (USA): mpg 15, cylinders 8, horsepower 150, weight 3,399, acceleration 11, year 73; Honda Civic (Japan): mpg 24, cylinders 4, horsepower 97, weight 2,489, acceleration 15, year 74; Ford Maverick (USA): mpg 21, cylinders 6, horsepower 72, weight 3,158, acceleration 19.5, year 75; Renault 12TL (Europe): mpg 27, cylinders 4, horsepower 75, weight 2,155, acceleration 14.5, year 76; Chevrolet Caprice (USA): mpg 17.5, cylinders 8, horsepower 145, weight 4,140, acceleration 13.7, year 77; Datsun 200SX (Japan): mpg 23.9, cylinders 4, horsepower 97, weight 2,405, acceleration 14.9, year 78; Saab 99GLE (Europe): mpg 21.6, cylinders 4, horsepower 115, weight 2,795, acceleration 15.7, year 78; Pontiac Phoenix (USA): mpg 33.5, cylinders 4, horsepower 88, weight 2,556, acceleration 13.6, year 78; Mercedes-Benz 300D (Europe): mpg 25.4, cylinders 5, horsepower 77, weight 3,530, acceleration 20.1, year 79; Oldsmobile Cutlass (USA): mpg 23.9, cylinders 8, horsepower 90, weight 3,420, acceleration 22.2, year 79; Mazda GLC (Japan): mpg 46.6, cylinders 4, horsepower 65, weight 2,110, acceleration 17.9, year 80; VW Rabbit Diesel (Europe): mpg 44.3, cylinders 4, horsepower 48, weight 2,085, acceleration 21.7, year 80; Toyota Cressida (Japan): mpg 25.4, cylinders 6, horsepower 116, weight 2,900, acceleration 12.6, year 81; Buick Skylark (USA): mpg 26.6, cylinders 4, horsepower 84, weight 2,635, acceleration 16.4, year 81; Honda Accord (Japan): mpg 36, cylinders 4, horsepower 88, weight 2,160, acceleration 14.5, year 82; Ford Ranger (USA): mpg 28, cylinders 4, horsepower 79, weight 2,625, acceleration 18.6, year 82; Peugeot 505S Turbo (Europe): mpg 28.1, cylinders 4, horsepower 80, weight 3,230, acceleration 20.4, year 81 USA Japan Europe Chevrolet Chevelle (USA): mpg 18, cylinders 8, horsepower 130, weight 3,504, acceleration 12, year 70 Ford Torino (USA): mpg 17, cylinders 8, horsepower 140, weight 3,449, acceleration 10.5, year 70 Plymouth Fury III (USA): mpg 14, cylinders 8, horsepower 215, weight 4,312, acceleration 8.5, year 70 Toyota Corona (Japan): mpg 24, cylinders 4, horsepower 95, weight 2,372, acceleration 15, year 70 Volkswagen 1131 (Europe): mpg 26, cylinders 4, horsepower 46, weight 1,835, acceleration 20.5, year 70 Peugeot 504 (Europe): mpg 25, cylinders 4, horsepower 87, weight 2,672, acceleration 17.5, year 70 Datsun PL510 (Japan): mpg 27, cylinders 4, horsepower 88, weight 2,130, acceleration 14.5, year 71 AMC Gremlin (USA): mpg 19, cylinders 6, horsepower 100, weight 2,634, acceleration 13, year 71 Ford Pinto (USA): mpg 25, cylinders 4, horsepower 86, weight 2,226, acceleration 16.5, year 71 Fiat 124B (Europe): mpg 30, cylinders 4, horsepower 76, weight 2,065, acceleration 14.5, year 71 Mazda RX2 Coupe (Japan): mpg 19, cylinders 3, horsepower 97, weight 2,330, acceleration 13.5, year 72 Volvo 145e (Europe): mpg 18, cylinders 4, horsepower 112, weight 2,933, acceleration 14.5, year 72 Buick Century 350 (USA): mpg 13, cylinders 8, horsepower 175, weight 4,100, acceleration 13, year 73 Toyota Corolla 1200 (Japan): mpg 31, cylinders 4, horsepower 65, weight 1,773, acceleration 19, year 71 Audi 100LS (Europe): mpg 23, cylinders 4, horsepower 91, weight 2,582, acceleration 14, year 73 Dodge Dart Custom (USA): mpg 15, cylinders 8, horsepower 150, weight 3,399, acceleration 11, year 73 Honda Civic (Japan): mpg 24, cylinders 4, horsepower 97, weight 2,489, acceleration 15, year 74 Ford Maverick (USA): mpg 21, cylinders 6, horsepower 72, weight 3,158, acceleration 19.5, year 75 Renault 12TL (Europe): mpg 27, cylinders 4, horsepower 75, weight 2,155, acceleration 14.5, year 76 Chevrolet Caprice (USA): mpg 17.5, cylinders 8, horsepower 145, weight 4,140, acceleration 13.7, year 77 Datsun 200SX (Japan): mpg 23.9, cylinders 4, horsepower 97, weight 2,405, acceleration 14.9, year 78 Saab 99GLE (Europe): mpg 21.6, cylinders 4, horsepower 115, weight 2,795, acceleration 15.7, year 78 Pontiac Phoenix (USA): mpg 33.5, cylinders 4, horsepower 88, weight 2,556, acceleration 13.6, year 78 Mercedes-Benz 300D (Europe): mpg 25.4, cylinders 5, horsepower 77, weight 3,530, acceleration 20.1, year 79 Oldsmobile Cutlass (USA): mpg 23.9, cylinders 8, horsepower 90, weight 3,420, acceleration 22.2, year 79 Mazda GLC (Japan): mpg 46.6, cylinders 4, horsepower 65, weight 2,110, acceleration 17.9, year 80 VW Rabbit Diesel (Europe): mpg 44.3, cylinders 4, horsepower 48, weight 2,085, acceleration 21.7, year 80 Toyota Cressida (Japan): mpg 25.4, cylinders 6, horsepower 116, weight 2,900, acceleration 12.6, year 81 Buick Skylark (USA): mpg 26.6, cylinders 4, horsepower 84, weight 2,635, acceleration 16.4, year 81 Honda Accord (Japan): mpg 36, cylinders 4, horsepower 88, weight 2,160, acceleration 14.5, year 82 Ford Ranger (USA): mpg 28, cylinders 4, horsepower 79, weight 2,625, acceleration 18.6, year 82 Peugeot 505S Turbo (Europe): mpg 28.1, cylinders 4, horsepower 80, weight 3,230, acceleration 20.4, year 81 Mpg 10 20 30 40 50 Cylinders 2 4 6 8 Horsepower 0 50 100 150 200 250 Weight 1,000 2,000 3,000 4,000 5,000 Acceleration 5 10 15 20 25 Year 70 75 80 85