Starting with polynomial:
P : t
Extension levels are: 1 6
-------------------------------------------------
Trying to find an order 6 Kronrod extension for:
P1 : t
Solvable: 1
-------------------------------------------------
Ending with final polynomial:
P : t^7 - 21*t^5 + 105*t^3 - 105*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
Positive weights:   7 out of 7
Indefinite weights: 0 out of 7
Negative weights:   0 out of 7
Extension rule has valid weights: 1
-------------------------------------------------
The nodes are:
| (-3.7504397177257422563 - 4.3836186980168060795e-193j)  +/-  (9.25e-63, 9.25e-63j)
| (3.7504397177257422563 - 1.306420176630260372e-200j)  +/-  (9.25e-63, 9.25e-63j)
| (-1.1544053947399681272 + 7.7868710555449746371e-208j)  +/-  (3.63e-63, 3.63e-63j)
| (2.3667594107345412886 - 1.4504177599297789181e-216j)  +/-  (1.7e-62, 1.7e-62j)
| (-3.3770170061145418279e-226 + 8.4425425152863545698e-227j)  +/-  (2.44e-225, 2.44e-225j)
| (1.1544053947399681272 + 3.0713790748582521955e-238j)  +/-  (3.63e-63, 3.63e-63j)
| (-2.3667594107345412886 + 1.8010659137179383904e-256j)  +/-  (1.7e-62, 1.7e-62j)
-------------------------------------------------
The weights are:
| (0.00054826885597221779162 - 4.5069064156832613669e-196j)  +/-  (1.81e-30, 5.77e-62j)
| (0.00054826885597221779162 - 3.2041584213852762554e-197j)  +/-  (8.95e-31, 2.9e-62j)
| (0.24012317860501271374 - 1.9374752526501058367e-195j)  +/-  (1.79e-28, 5.71e-60j)
| (0.03075712396758649704 + 2.9427254514314096949e-196j)  +/-  (6.84e-30, 2.23e-61j)
| (0.45714285714285714286 + 1.850432834498382747e-195j)  +/-  (9.83e-29, 3.32e-60j)
| (0.24012317860501271374 - 1.025466031365207918e-195j)  +/-  (4.28e-29, 1.41e-60j)
| (0.03075712396758649704 + 1.3009681301559689375e-195j)  +/-  (4.65e-30, 1.32e-61j)
