Table 3: Fitted orbital elements to the radial-velocity measurements for the six stars, characteristics of their planet candidate companions and properties of the fit. When necessary, we replaced the fit error by the confidence interval value issued from Monte-Carlo simulations (see text). The $m_{\rm 2} \sin i$ value is based on the $M_{\ast }$ listed in Table 2. $N_{\rm meas}$ is the number of measurements that are effectively used in the orbital solution fit. $\langle\epsilon_{\rm RV}\rangle$ is the mean measurement error and $\sigma ({\rm O-C})$ is the weighted rms of the residual. Comparison of the two values gives an indication of the amount of "jitter'' which can also be appreciated from the $\chi ^{2}_{\rm red}$ value (the reduced $\chi ^{2}$ equal to $\chi ^{\rm 2}/\nu$ where $\nu$ is the number of degrees of freedom).

HD 8574 HD 23596 HD 33636 $^{\natural}$

P (days) 227.55 $\pm$ 0.77 1565 $\pm$ 21 2828 $\pm$ $\rm ^{1090}_{525}$

T (JD) 2 451 467.5 $\pm$ 6.6 2 451 604 $\pm$ 15 2 451 211 $\pm$ 22

e 0.288 $\pm$ 0.053 0.292 $\pm$ 0.023 0.55 $\pm$ 0.10

$\gamma$ (km s $^{\rm -1}$ ) 18.919 $\pm$ 0.002 -10.099 $\pm$ 0.002 5.629 $\pm$ 0.035

w ( $\hbox{$^\circ$ }$ ) 3.6 $\pm$ 10.9 274.1 $\pm$ 3.9 340.2 $\pm$ 6.1

$K_{\rm 1}$ (m s $^{\rm -1}$ ) 66 $\pm$ 5 124 $\pm$ 3 168 $\pm$ 15

$a_{\rm 1} \sin i$ ( $10^{\rm -3}$ AU) 1.32 17.1 36.7

$f_{\rm 1}(m)$ (10^-9 ${ M_{\odot}}$ ) 5.97 274 822

$m_{\rm 2} \sin i$ ( $M_{\rm Jup}$ ) 2.11 8.10 10.58

a (AU) 0.77 2.88 4.08

$a_{\rm min}^{\dag }$ (AU) 0.55 2.04 1.83

$a_{\rm max}^{\ddag }$ (AU) 0.99 3.73 6.32

$N_{\rm meas}$ 41 39 47

$\langle\epsilon_{\rm RV}\rangle$ (m s $^{\rm -1}$ ) 10.2 9.2 10.4

$\sigma ({\rm O-C})$ (m s $^{\rm -1}$ ) 13.1 9.2 9.0

$\chi^{\rm 2}_{\rm red}$ 1.99 1.19 0.996

HD 50554 HD 106252 HD 190228

P (days) 1293 $\pm$ 37 1600 $\pm$ 18 1146 $\pm$ 16

T (JD) 2 451 832.4 $\pm$ 15 2 451 871 $\pm$ 17 2 451 236 $\pm$ 25

e 0.501 $\pm$ 0.030 0.471 $\pm$ 0.028 0.499 $\pm$ $\rm ^{0.047}_{0.024}$

$\gamma$ (km s $^{\rm -1}$ ) -3.817 $\pm$ 0.002 15.531 $\pm$ 0.003 -50.182 $\pm$ 0.004

w ( $\hbox{$^\circ$ }$ ) 355.7 $\pm$ 4.4 292.2 $\pm$ 3.2 100.7 $\pm$ $\rm ^{2.9}_{3.2}$

$K_{\rm 1}$ (m s $^{\rm -1}$ ) 104 $\pm$ 5 147 $\pm$ 4 91 $\pm$ 5

$a_{\rm 1} \sin i$ ( $10^{\rm -3}$ AU) 10.7 19.1 8.30

$f_{\rm 1}(m)$ (10^-9 ${ M_{\odot}}$ ) 96.9 362 58.1

$m_{\rm 2} \sin i$ ( $M_{\rm Jup}$ ) 5.16 7.56 3.58

a (AU) 2.41 2.70 2.02

$a_{\rm min}^{\dag }$ (AU) 1.20 1.43 1.01

$a_{\rm max}^{\ddag }$ (AU) 3.62 3.97 3.02

$N_{\rm meas}$ 41 40 51

$\langle\epsilon_{\rm RV}\rangle$ (m s $^{\rm -1}$ ) 10.0 10.6 8.7

$\sigma ({\rm O-C})$ (m s $^{\rm -1}$ ) 11.8 10.5 8.0

$\chi^{\rm 2}_{\rm red}$ 1.68 1.21 0.973

$^{\natural}$ 5 Coralie measurements are included in the solution for HD 33636 (see text).
$^{\dag }$ At periastron.
$^{\ddag }$ At apoastron.

**Table 3:** Fitted orbital elements to the radial-velocity measurements for the six stars, characteristics of their planet candidate companions and properties of the fit. When necessary, we replaced the fit error by the confidence interval value issued from Monte-Carlo simulations (see text). The $m_{\rm 2} \sin i$ value is based on the $M_{\ast }$ listed in Table 2. $N_{\rm meas}$ is the number of measurements that are effectively used in the orbital solution fit. $\langle\epsilon_{\rm RV}\rangle$ is the mean measurement error and $\sigma ({\rm O-C})$ is the weighted rms of the residual. Comparison of the two values gives an indication of the amount of "jitter'' which can also be appreciated from the $\chi ^{2}_{\rm red}$ value (the reduced $\chi ^{2}$ equal to $\chi ^{\rm 2}/\nu$ where $\nu$ is the number of degrees of freedom).
		HD 8574	HD 23596	HD 33636 $^{\natural}$
P	(days)	227.55 $\pm$ 0.77	1565 $\pm$ 21	2828 $\pm$ $\rm ^{1090}_{525}$
T	(JD)	2 451 467.5 $\pm$ 6.6	2 451 604 $\pm$ 15	2 451 211 $\pm$ 22
e		0.288 $\pm$ 0.053	0.292 $\pm$ 0.023	0.55 $\pm$ 0.10
$\gamma$	(km s $^{\rm -1}$ )	18.919 $\pm$ 0.002	-10.099 $\pm$ 0.002	5.629 $\pm$ 0.035
w	( $\hbox{$^\circ$ }$ )	3.6 $\pm$ 10.9	274.1 $\pm$ 3.9	340.2 $\pm$ 6.1
$K_{\rm 1}$	(m s $^{\rm -1}$ )	66 $\pm$ 5	124 $\pm$ 3	168 $\pm$ 15
$a_{\rm 1} \sin i$	( $10^{\rm -3}$ AU)	1.32	17.1	36.7
$f_{\rm 1}(m)$	(10^-9 ${ M_{\odot}}$ )	5.97	274	822
$m_{\rm 2} \sin i$	( $M_{\rm Jup}$ )	2.11	8.10	10.58
a	(AU)	0.77	2.88	4.08
$a_{\rm min}^{\dag }$	(AU)	0.55	2.04	1.83
$a_{\rm max}^{\ddag }$	(AU)	0.99	3.73	6.32
$N_{\rm meas}$		41	39	47
$\langle\epsilon_{\rm RV}\rangle$	(m s $^{\rm -1}$ )	10.2	9.2	10.4
$\sigma ({\rm O-C})$	(m s $^{\rm -1}$ )	13.1	9.2	9.0
$\chi^{\rm 2}_{\rm red}$		1.99	1.19	0.996
		HD 50554	HD 106252	HD 190228
P	(days)	1293 $\pm$ 37	1600 $\pm$ 18	1146 $\pm$ 16
T	(JD)	2 451 832.4 $\pm$ 15	2 451 871 $\pm$ 17	2 451 236 $\pm$ 25
e		0.501 $\pm$ 0.030	0.471 $\pm$ 0.028	0.499 $\pm$ $\rm ^{0.047}_{0.024}$
$\gamma$	(km s $^{\rm -1}$ )	-3.817 $\pm$ 0.002	15.531 $\pm$ 0.003	-50.182 $\pm$ 0.004
w	( $\hbox{$^\circ$ }$ )	355.7 $\pm$ 4.4	292.2 $\pm$ 3.2	100.7 $\pm$ $\rm ^{2.9}_{3.2}$
$K_{\rm 1}$	(m s $^{\rm -1}$ )	104 $\pm$ 5	147 $\pm$ 4	91 $\pm$ 5
$a_{\rm 1} \sin i$	( $10^{\rm -3}$ AU)	10.7	19.1	8.30
$f_{\rm 1}(m)$	(10^-9 ${ M_{\odot}}$ )	96.9	362	58.1
$m_{\rm 2} \sin i$	( $M_{\rm Jup}$ )	5.16	7.56	3.58
a	(AU)	2.41	2.70	2.02
$a_{\rm min}^{\dag }$	(AU)	1.20	1.43	1.01
$a_{\rm max}^{\ddag }$	(AU)	3.62	3.97	3.02
$N_{\rm meas}$		41	40	51
$\langle\epsilon_{\rm RV}\rangle$	(m s $^{\rm -1}$ )	10.0	10.6	8.7
$\sigma ({\rm O-C})$	(m s $^{\rm -1}$ )	11.8	10.5	8.0
$\chi^{\rm 2}_{\rm red}$		1.68	1.21	0.973

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