Table 4: Observed orbital period modulations in CVs.
Object $P_{{\rm orb}}$ $P_{{\rm mod}}$ $\Delta P/P$ Ref.
  (h) (yr) ( $\times 10^{-6}$)  
V4140 Sgr 1.47 6.9 0.93 1
V2051 Oph 1.50 22 0.30 1
OY Car 1.51 35 0.52 2
EX Hya 1.64 17.5 0.55 3
HT Cas 1.77 36 0.44 This work
Z Cha 1.79 28 0.85 4
IP Peg 3.80 4.7 8.00 5
U Gem 4.17 8 3.00 6
DQ Her 4.65 13.7 2.00 7
UX UMa 4.72 7.1, 10.7, 30.4$^{\ast}$ 2.60 8
T Aur 4.91 23 3.80 9, this work
EX Dra 5.03 5 7.90 10
RW Tri 5.57 7.6, 13.6$^{\ast}$ 2.10 11
AC Cnc 7.21 16.2 5.50 12
$^{\ast}$ Multiperiodic (the best determined periodicities are considered). References: (1) Baptista et al. (2003); (2) Greenhill et al. (2006); (3) Hellier & Sproats (1992); (4) Baptista et al. (2002); (5) Wolf et al. (1993); (6) Warner (1988); (7) Zhang et al. (1995); (8) Rubenstein et al. (1991); (9) Beuermann & Pakull (1984); (10) Shafter & Holland (2003); (11) Robinson et al. (1991); (12) Qian et al. (2007b).

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