+-------------+------------+
| x1          | x2         |
+=============+============+
| a                        |
+-------------+------------+
| -0.65470589 | -0.1692089 |
+-------------+------------+
| -0.49824606 |  0.5763153 |
+-------------+------------+
|  0.33230864 | -0.5149627 |
+-------------+------------+
| b                        |
+-------------+------------+
|  1.12146881 | -0.4805023 |
+-------------+------------+
| -0.06394603 |  0.7634626 |
+-------------+------------+
| c                        |
+-------------+------------+
|  1.53760239 |  0.7914405 |
+-------------+------------+
| a                        |
+-------------+------------+
| -0.11144127 |  1.7435388 |
+-------------+------------+
|  0.24231271 |  1.6937668 |
+-------------+------------+ 
