Table 4: The regression coefficients for the transformations and normality lines. The absolute values and errors vary due to the inhomogeneous "standard'' observations (photographic, photoelectric and CCD) found in the literature as well as the dependence on the magnitude range in common, i.e. a broader range guarantees a small error. The offsets are due to the four different telescopes and thus instruments as well as CCD used (Table 1), the deviating results for the slopes are discussed in the beginning of Sect. 3. The errors in the final digits of the corresponding quantity are given in parentheses.
Cluster $V~=~a~+~b\cdot(y)$ , N $a_{0}~=~a~+~b\cdot(g_{1}-y)$ , N

Be 11 -3.54(13)/1.01(1)/66 0.199(1)/0.334(6)/49

Be 94 -2.70(36)/0.93(2)/14 0.366(1)/0.692(7)/74

Ha 15 -5.46(37)/1.01(2)/13 0.179(2)/0.277(9)/79

Ly 1 -0.26(4)/1.01(1)/127 0.335(5)/0.223(14)/25

N 6031 -0.12(4)/1.01(1)/151 0.345(1)/0.217(9)/63

N 6405 -5.88(11)/1.03(1)/107 0.306(1)/0.274(3)/131

N 6834 -2.70(33)/0.95(2)/120 0.351(1)/1.129(9)/192

Ru 130 -5.32(6)/1.00(1)/111 0.930(2)/0.299(4)/136

**Table 4:** The regression coefficients for the transformations and normality lines. The absolute values and errors vary due to the inhomogeneous "standard'' observations (photographic, photoelectric and CCD) found in the literature as well as the dependence on the magnitude range in common, i.e. a broader range guarantees a small error. The offsets are due to the four different telescopes and thus instruments as well as CCD used (Table 1), the deviating results for the slopes are discussed in the beginning of Sect. 3. The errors in the final digits of the corresponding quantity are given in parentheses.
Cluster	$V~=~a~+~b\cdot(y)$ , N	$a_{0}~=~a~+~b\cdot(g_{1}-y)$ , N
Be 11	-3.54(13)/1.01(1)/66	0.199(1)/0.334(6)/49
Be 94	-2.70(36)/0.93(2)/14	0.366(1)/0.692(7)/74
Ha 15	-5.46(37)/1.01(2)/13	0.179(2)/0.277(9)/79
Ly 1	-0.26(4)/1.01(1)/127	0.335(5)/0.223(14)/25
N 6031	-0.12(4)/1.01(1)/151	0.345(1)/0.217(9)/63
N 6405	-5.88(11)/1.03(1)/107	0.306(1)/0.274(3)/131
N 6834	-2.70(33)/0.95(2)/120	0.351(1)/1.129(9)/192
Ru 130	-5.32(6)/1.00(1)/111	0.930(2)/0.299(4)/136

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