Table 1: List of LMXBs with the simultaneously detected twin kHz QPOs or spin frequencies.
Sources $\nu$1(1) $\nu$2(2) $\Delta$$\nu$(3) $\nu$2/$\nu$1(4) $\nu$ $_{\rm burst}$(5) $\nu$ $_{\rm pulse}$(6) References
  (Hz) (Hz) (Hz)   (Hz) (Hz)  
Millisecond pulsars (7)              
IGR J00291+5934 - - - - - 599 1
XTE J0929-314 - - - - - 185 K
XTE J1751-305 - - - - - 435 K
XTE J1807-294 127-360 353-587 179-247 1.51-2.78 - 191 2, 3
SAX J1808.4-3658 499 694 195 1.39 401 401 K, 4
XTE J1814-338 - - - - 314 314 K
HETE J1900.1-2455a - - - - - 377 5
Z sources (8)              
Sco X-1 544-852 844-1086 223-312 1.26-1.57 - 649$^{\dag }$ M, B, K
GX 340+0 197-565 535-840 275-413 1.49-2.72 - 412$^{\dag }$ B, K, P, 6
GX 349+2 712-715 978-985 266-270 1.37-1.38 - 752$^{\dag }$ B, K, 7
GX 5-1 156-634 478-880 232-363 1.38-3.06 - 368$^{\dag }$ B, K, P, 8
GX 17+2 475-830 759-1078 233-308 1.28-1.60 - 584$^{\dag }$ B, K, P, 9
Cyg X-2 532 856 324 1.61 - 658$^{\dag }$ B, K, P
Cir X-1 56-226 229-505 173-340 2.23-4.19 - 176$^{\dag }$ 10
XTE J1701-462 620 909 289 1.47 - 699$^{\dag }$ 11
Atoll sources (16)              
4U 0614+09 153-823 449-1162 238-382 1.38-2.93 - 345$^{\dag }$ B, K, P, 12, 13
XB 1254-690 - - - - 95 - 14
4U 1608-52 476-876 802-1099 224-327 1.26-1.69 619 - M, B, K, 15
4U 1636-53 644-921 971-1192 217-329 1.24-1.51 581 - B, K, P, 16, 17
4U 1702-43 722 1055 333 1.46 330 - K, P, 18
4U 1705-44 776 1074 298 1.38 - 826$^{\dag }$ B, K, P
4U 1728-34 308-894 582-1183          
4U 1728-34 3081183 271-359 1.31-1.89 363 - B, K, P, 13, 19  
KS 1731-260 903 1169 266 1.29 524 - B, K, P
4U 1735-44 640-728 982-1026 296-341 1.41-1.53 - 755$^{\dag }$ B, K, P
XTE J1739-285a - - - - 1122 - 20
A 1744-361a - - - - 530 - 21
SAX J1750.8-2900a - - - - 601 - K, 22
4U 1820-30 790 1064 273 1.35 - 818$^{\dag }$ B, K, P
Aql X-1a - - - - 549 - B, K, P
4U 1915-05 224-707 514-1055 290-353 1.49-2.3 270 - B, K, P
XTEJ2123-058 849-871 1110-1140 261-270 1.31-1.31 - 854$^{\dag }$ B, K, P
Other sources (4)              
EXO 0748-676a - - - - 45 - K, 23
- MXB 1659-298 - - - - 567 - K, 24
MXB 1743-29 - - - - 589 - K, 25
SAX J1748.9-2021 - - - - 410 - K, 26
a Sources with only a single QPO detected. $^{\dag }$ The inferred upper limit of the spin frequency using the relation $\nu_{\rm s}<\nu_{\rm 2~min}/1.3$ (see text). 1 Lower-frequencies; 2 upper-frequencies; 3 separations of twin kHz QPOs; 4 ratios between the upper- and lower-frequencies; 5 burst frequency $\nu$ $_{\rm burst}$; 6 coherent spin frequency $\nu$ $_{\rm pulse}$. K: van der Klis (2000); M: Méndez et al. (1998), Méndez & van der Klis (1999), (2000); B: Belloni et al. (2002), (2005); P: Psaltis et al. (1999a,b.) 1: Chakrabarty (2004); 2: Linares et al. (2005); 3: Zhang et al. (2006b); 4: Wijnands et al. (2003); 5: Kaaret et al. (2005); 6: Jonker et al. (2000); 7: O'Neill et al. (2002); 8: Jonker et al. (2002b); 9: Homan et al. (2002); 10: Boutloukos et al. (2006); 11: Homan (2006); 12: van Straaten et al. (2002); 13: van Straaten et al. (2000); 14: Bhattacharyya (2006); 15: van Straaten et al. (2003); 16: Di Salvo et al. (2003); 17: Jonker et al. (2002a); 18: Markwardt et al. (1999); 19: Migliari et al. (2003); 20: Kaaret et al. (2007); 21: Bhattacharyya et al. (2006); 22: Kaaret et al. (2002); 23: Homan and van der Klis (2000); 24: Wijnands et al. (2001); 25: Strohmayer et al. (1997); 26: Kaaret et al. (2003).


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