Starting with polynomial:
P : t
Extension levels are: 1 6
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Trying to find an order 6 Kronrod extension for:
P1 : t
Solvable: 1
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Ending with final polynomial:
P : t^7 - 21/13*t^5 + 105/143*t^3 - 35/429*t
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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
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The nodes are:
| (0.94910791234275852453 - 1.015251749321228105e-190j)  +/-  (1.29e-62, 1.29e-62j)
| (-0.74153118559939443986 - 2.0199714960461442414e-189j)  +/-  (1.78e-62, 1.78e-62j)
| (-0.94910791234275852453 + 1.4631905978258916167e-198j)  +/-  (1.51e-62, 1.51e-62j)
| (-0.40584515137739716691 - 7.6043662651806392941e-211j)  +/-  (3.42e-63, 3.42e-63j)
| (0.40584515137739716691 + 2.2131618651272261323e-220j)  +/-  (3.42e-63, 3.42e-63j)
| (0.74153118559939443986 - 2.8180025866987458223e-232j)  +/-  (1.92e-62, 1.92e-62j)
| (5.8581906792798084173e-244 - 4.6865525434238467338e-243j)  +/-  (3.31e-242, 3.31e-242j)
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The weights are:
| (0.12948496616886969327 + 2.3252331780058042477e-190j)  +/-  (6.18e-27, 1.47e-57j)
| (0.2797053914892766679 - 9.5510152234100061989e-190j)  +/-  (2.69e-27, 6.41e-58j)
| (0.12948496616886969327 - 8.624353422053862782e-190j)  +/-  (1.32e-27, 3.12e-58j)
| (0.38183005050511894495 + 2.7271841055772997469e-189j)  +/-  (1.03e-27, 2.48e-58j)
| (0.38183005050511894495 + 9.0432545079726647276e-190j)  +/-  (4.94e-28, 1.14e-58j)
| (0.2797053914892766679 - 5.7924771342221715511e-190j)  +/-  (3.03e-28, 6.65e-59j)
| (0.41795918367346938776 - 1.4672482962065425913e-189j)  +/-  (3.35e-28, 8.37e-59j)
