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J. .. , ?69 ? 19 ? 54.17 ?? Reference Epoch (MJD)

, Spin Frequency, ? (Hz)

. .. Mjd), , p.1

). .. Hz, ?0.56 × 10 ?8 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 2.74 × 10 ?5 Increment in? (10 ?21 Hz s ?2 )

. .. Solar-system-ephemeris, 54602 -55898 RMS Timing Residuals (ms)

, Table S1: Timing parameters for PSR J0540?6919

J. .. , 05 h 37 m 47.36 s Declination, ? J2000

, Spin Frequency, ? (Hz)

. .. Mjd), , p.1

). .. Hz, 6.5921 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 22.4152 × 10 ?6 Continued on next page Parameter Value Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 21.2181 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 13.4614 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 13.0182 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 34.0678 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 10.4278 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 7.6476 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 0.6292 × 10 ?6 Increment in? (10 ?10 Hz s ?1 )

). .. Hz, 5.4499 × 10 ?6 Increment in? (10 ?10 Hz s ?1 ), p.156

). .. Hz, 28.1097 × 10 ?6 Continued on next page Parameter Value Increment in? (10 ?10 Hz s ?1 )

. .. Solar-system-ephemeris, 54774 -55701 RMS Timing Residuals (ms)

, Table S2: Timing parameters for PSR J0537?6910