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In 2016, we published "A test of general relativity using the LARES andLAGEOS satellites and a GRACE Earth gravity model. Measurement of Earth'sdragging of inertial frames [1]", a measurement of frame-dragging, afundamental prediction of Einstein's theory of General Relativity, using thelaser-ranged satellites LARES, LAGEOS and LAGEOS 2. The formal error, orprecision, of our test was about 0.2% of frame-dragging, whereas the systematicerror was estimated to be about 5%. In the 2017 paper "A comment on "A test ofgeneral relativity using the LARES and LAGEOS satellites and a GRACE Earthgravity model by I. Ciufolini et al." "by L. Iorio [2] (called I2017 in thefollowing), it was incorrectly claimed that, when comparing different Earthgravity field models, the systematic error in our test due to the Earth's evenzonal harmonics of degree 6, 8, 10 could be aslarge as 15%, 6% and 36%,respectively. Furthermore, I2017 contains other, also incorrect, claims aboutthe number of necessary significant decimal digits of the coefficients used inour test (claimed to be nine), in order to eliminate the largest uncertaintiesin the even zonals of degree 2 and 4, and about the non-repeatability of ourtest. Here we analyze and rebut those claims in I2017.

"Reply to A comment on A test of general relativity using the LARES and LAGEOS satellites and a GRACE Earth gravity model, by I. Ciufolini et al."