// import { Component, forwardRef} from '@angular/core';
// import { ExtBase } from './ext.base';
// @Component({
//   selector: 'ext-cartesian2',
//   template: '<div>ext-cartesian2</div>',
//   providers: [
// 		{ provide: ExtBase, useExisting: forwardRef(() => ExtCartesian2) }
// 	]
// })
// export class ExtCartesian2 extends ExtBase{
// }