0.453(44)   0.441(61)   0.166 
  [**1675–1710**]{}             1.779(37)                   0.738(37)   0.685(51)     0.344(37)   0.420(52)   0.157 
  [**2020–2100**]{}             1.416(29)                   0.656(29)   0.553(40)     0.303(30)   0.334(41)   0.125 
  [**2410–2500**]{}             1.130(25)                   0.627(25)   0.463(34)     0.236(25)   0.257(34)   0.108 
  [**2900–2985**]{}             0.942(45)                                                                           
  [**Zero-Order**]{}            0.578(15)                   0.417(14)   0.323(21)     0.120(15)   0.178(21)   0.062 
                                                                                                                    
                                                                                                                    
  [**B**]{}                     0.354(25)                   0.259(38)   0.025(33)     0.046(35)   0.047(31)   0.045 
  [**V**]{}                     0.182(14)                   0.129(22)   0.050(19)     0.006(21)   0.023(18)   0.026 
  [**R$_{c}$**]{}               0.134(13)                   0.091(20)   0.026(16)     0.020(21)   0.037(16)   0.021 
  [**I$_{c}$**]{}               0.109(10)                   0.054(16)   0.022(14)     0.031(17)   0.015(13)   0.016 
                                                                                                                    
                                                                                                                    
  [**NV flux**]{}             14.37(1.98)    6.75(1.97)   12.75(1.37)               12.25(1.37)                3.32   0.256(41)
  [**SiIV flux**]{}           15.40(1.54)   13.17(1.53)    7.60(1.07)                7.77(1.07)                2.75 
  [**CIV flux**]{}            77.10(2.87)   36.74(2.86)   35.71(1.98)               22.22(1.99)               16.99   0.057(08)
  [**HeII flux**]{}           31.81(1.59)   14.68(1.60)   22.57(1.10)               13.40(1.11)                2.75   0.173(10)
  [**Ly$\alpha$ abs.**]{}     23.35(1.08)                  6.83(1.07)                                          3.41 
                                                                                                                    
  ------------------------- ------------- ------------- ------------- ----------- ------------- ----------- ------- -----------

Notes: (1) Continuum flux amplitudes are in units of $10^{-14}$ while line fluxes are in units of $10^{-14}$. Errors in parentheses are referred to the last significant digits.\
(2) $\bar{A}_{res}$ is the average amplitude of the DFT of the residuals, calculated for frequencies $\la$1.4mHz.\
(3) For the $\lambda \lambda$ 2900–2985 band only the orbital amplitude is reported as derived from IUE data.\

A strong colour effect in the UV continuum is detected with amplitudes decreasing at longer wavelengths. Different from other lines is the behaviour in the  feature, whose absorption component is modulated at 