Starting with polynomial:
P : t^3 - 3*t
Extension levels are: 3 6
-------------------------------------------------
Trying to find an order 6 Kronrod extension for:
P1 : t^3 - 3*t
Solvable: 1
-------------------------------------------------
Ending with final polynomial:
P : t^9 - 117/4*t^7 + 945/4*t^5 - 2205/4*t^3 + 945/4*t
-------------------------------------------------
Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
 current precision for weights: 53
Linear system for weights solvable: 1
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 1
Sufficient bits for target precision reached
-------------------------------------------------
The nodes are:
| (-2.8612795760570581173 - 5.635362925894614124e-132j)  +/-  (4.78e-62, 4.78e-62j)
| (2.8612795760570581173 + 6.7178761075670887518e-139j)  +/-  (4.78e-62, 4.78e-62j)
| (-1.7320508075688772935 + 0j)  +/-  (2.04e-62, 2.04e-62j)
| (0.74109534999454084186 - 1.2219745453998418728e-150j)  +/-  (4.19e-63, 4.19e-63j)
| (1.7320508075688772935 + 1.1653657392500323036e-155j)  +/-  (2.48e-62, 2.48e-62j)
| (-4.1849560176727318607 + 4.5522099189454386861e-159j)  +/-  (3.68e-62, 3.68e-62j)
| (4.1849560176727318607 - 4.4455174989701549669e-162j)  +/-  (3.68e-62, 3.68e-62j)
| (-0.74109534999454084186 + 2.2641777826932291477e-172j)  +/-  (4.19e-63, 4.19e-63j)
| (-1.0342254059756258516e-186 - 3.6772458879133363613e-185j)  +/-  (3.31e-184, 3.31e-184j)
-------------------------------------------------
The weights are:
| (0.0079963254708935327699 - 7.9454024931011369039e-134j)  +/-  (2.16e-29, 7.13e-60j)
| (0.0079963254708935327699 - 7.8744927062107114958e-135j)  +/-  (7.43e-30, 2.44e-60j)
| (0.094850948509485094851 + 2.1809440482490956433e-133j)  +/-  (2.31e-28, 7.65e-59j)
| (0.27007432957793787076 - 2.1696822442030668616e-133j)  +/-  (3.77e-28, 1.18e-58j)
| (0.094850948509485094851 + 5.3616563105581855577e-134j)  +/-  (7.93e-29, 2.62e-59j)
| (9.4269457556517489445e-05 - 2.5604369206817345803e-135j)  +/-  (2.13e-31, 7.16e-62j)
| (9.4269457556517489445e-05 + 4.8099271054119723917e-136j)  +/-  (1.95e-31, 6.34e-62j)
| (0.27007432957793787076 - 3.6864758180953963592e-133j)  +/-  (1.52e-28, 4.07e-59j)
| (0.25396825396825396825 + 4.0331280014671752004e-133j)  +/-  (8.7e-29, 3.12e-59j)
