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The staggered order was previously evidenced from a continuous and symmetric splitting of $^{14}$N NMR spectral lines on lowering temperature below $T_c\\simeq 330$ mK, with a saturation towards $\\simeq 150$ mK. Unexpectedly, the split lines begin to further separate away below $T^*\\sim 100$ mK while the line width and shape remain completely invariable. 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