## Data Definition


#### Label
Type: `string`

Default validate:  
```js
function validate(d) {
	          return this.accessor(d) !== undefined;
	        }
```

Default accessor:  
```js
function accessor(line) {
	          return String(line[0]);
	        }
```

#### Value
Type: `number`

Default validate:  
```js
function validate(d) {
	          return !isNaN(this.accessor(d));
	        }
```

Default accessor:  
```js
function accessor(line) {
	          return parseFloat(line[1]);
	        }
```