Table 3: General spectroscopic properties of the knots.
Knot C WHT C INT N WHT N INT 7 WHT #7 INT #1 #3 #8 #13 #14 #15
-MB 20.61 20.61 18.06 18.06 17.60 17.60 16.34 17.20 16.46 17.62 17.07 15.11
$\pm$ 0.03 0.03 0.03 0.03 0.04 0.04 0.05 0.03 0.05 0.05 0.05 0.08

Slit ( $\hbox{$^{\prime\prime}$ }\times$ 1 $\hbox{$^{\prime\prime}$ }$)		 5.4 12 3.6 8.4 6.0 3.6 5.6 4.0 5.2 7.2 5.6 8.0
Distance ( $\hbox{$^{\prime\prime}$ }$)a 0 0 77.0 77.0 9.8 10.0 47.6 35.2 10.9 10.8 8.0 19.2

C(H$\beta $)b		 0.17 0.25 0.17 0.12 0.24 0.25 0.10 0.10 0.12 0.62 0.11 0.29
$\pm$ 0.02 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.12 0.04 0.05

$W_{{\rm abs}}$b,c		 1.7 2.4 0.2 0.9 2.9 1.5 ... ... 1.1 2 5.6 2
$\pm$ 0.1 0.3 0.2 0.2 0.5 0.3 ... ... 0.3 ... 1.7 ...

$T_{\rm e}[$O III]d		 0.71 0.74 1.09 1.13 0.77 0.78 0.82 0.76 0.88 0.82 0.86 0.81
$T_{\rm e}[$O II]e 0.80 0.82 1.06 1.09 0.84 0.84 0.88 0.83 0.92 0.87 0.90 0.87
$N_{\rm e}$ (cm-3) 220 170 115 150 120 210 ... ... 150 120 <100 <100

$\Delta v_r$f		 0 0 +117 +110 +118 +122 -63 +8 +125 -85 -70 -75
$\pm$ ... ... 15 27 15 27 27 80 27 27 35 35

F(H$\beta $)g		 133 184 4.58 11.3 16.6 1.76 3.05: 1.58: 6.03 1.92 8.46 0.94:
$\pm$ 4 6 0.16 0.6 0.7 0.09 ... ... 0.37 0.26 0.62 ...

W(H$\alpha $)c		 87.4 87.3 53.6 66.5 330 256 110 20: 72.0 30.9 140 39.7
$\pm$ 2.6 3.4 2.1 8.2 25 28 25 ... 4.5 2.8 20 9.5

W(H$\beta $)c		 22.3 22.9 25.0 27.4 62.3 66 ... ... 16.6 5.6 52 8.0:
$\pm$ 0.9 2.1 1.6 2.4 5.4 12 ... ... 2.6 1.3 8 ...

W(H$\gamma$)c		 8.1 6.6 8.2 5.3 34.3 20.2 ... ... 8.3 ... 18 ...
$\pm$ 0.4 0.6 0.9 0.5 4.9 2.2 ... ... 1.6 ... 5 ...

W([O III])c		 16.7 20.5 144 46.6 116 63.2 ... ... 25.7 6.8 42.0 7.8:
$\pm$ 0.6 0.9 18 3.7 9 3.6 ... ... 2.8 1.2 3.6 ...

Ageh		 6.0 6.0 7 6 5.0 4.5 6 150 6 8.5 5 8.0
$\pm$ 0.5 0.5 1 1 0.5 0.5 2 30 1 1.5 1 1.5
a Distance from the center of Mkn 1087.
b C(H$\beta $) and $W_{{\rm abs}}$ calculated iteratively. See Sect. 3.2 for more details.
c In Å.
d In units of 104 K, calculated using empirical calibrations of Pilyugin (2001).
e In units of 104 K, $T_{\rm e}[$OII] calculated from empirical calibration and the relation given by Garnett (1992).
f Radial velocity with respect to the center of Mkn 1087, in km s-1.
g In units of 10 $\rm ^{-16}$ erg s$\rm ^{-1}$ cm$\rm ^{-2}$ .
h Estimated ages using our spectroscopical and photometric data, in Myr. See Sect. 4.1 for more details.

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