The Arduino code for Tom Igoe's graphing processing code

five_analog_inputs_for_data_grapher.ino

/*
  Read in five analog sensor values, send them out
 as tab-delimited ASCCI-encoded decimal numbers,
 ended by a carriage return and newline
 
 created 15 Oct. 2007
 
 */
void setup() {
  // iniaialize the serial port:
  Serial.begin(9600);
}

void loop() {
  // count from 0 to 4 (five channels):
  for (int channel=0; channel <=4; channel++) {
    // read an analog input, divide the result by 4
    // to limit it to 0-255:
    int sensorValue = analogRead(channel)/4;
    // print it:
    Serial.print(sensorValue, DEC);
    // if it's not the last channel to be read,
    // print a tab character:
    if (channel < 4) {
      Serial.print("\t");
    }
    // delay to let the analog-to-digital converter settle:
    delay(8);
  }
  // once you've printed all the values, 
  // print a newline and carriage return:
  Serial.println();
}

http://wiki.processing.org/w/Tom_Igoe_Interview

from there

Yes, this is printing out tab separated values to the serial port, reading for give analog ports.