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{\bf{ Figure 1: }}
             Diagrams 
              (a) $s$-channel resonant production and
              (b) $u$-channel exchange of a leptoquark with
              fermion number $F = 2$.
              Diagrams involving a $ F = 0$ leptoquark are
              obtained from (a) and (b) by exchanging $q$ and
              $\bar{q}$. \\
\vspace*{0.5cm}
{\bf{ Figure 2: }}
           Kinematics in the $y_e -M_e$ plane of the selected NC DIS
           candidates. Three isocurves at $Q^2 = 2500, 15000$ 
           and $30000 \GeV^2$ are also shown as full lines.  \\
\vspace*{0.5cm}
{\bf{ Figure 3: }}
           Distributions of (a) the transverse energy and (b)
           the polar angle of the electron; (c) the missing transverse 
           momentum and (d) the transverse momentum of the highest
           $P_T$ jet for the selected NC DIS candidates.
           Symbols correspond to data events and histograms
           to SM simulation. \\
\vspace*{0.5cm}
{\bf{ Figure 4: }}
                $Q^2_e$ distribution of the 
                selected NC DIS candidate
                events for the data ($\bullet$ symbols) and for standard
                NC DIS expectation (histogram);
                (b) ratio of the observed and expected (from
                NC DIS) number of
                events as a function of $Q^2_e$;
                the lines above and below unity specify the
                $\pm 1\sigma$ levels determined using the combination
                of statistical and systematic errors of
                the DIS expectation. \\
\vspace*{0.5cm}
{\bf{ Figure 5a,b: }} 
         Mass spectra for NC DIS-like final states
         for data (symbols) and DIS expectation (histograms).
         The NC DIS-like comparison is shown before (open triangles,
         white histogram) and after (closed dots, hatched histogram)
         a $y$ cut designed to maximize the significance of an eventual
         (a) scalar and (b) vector LQ signal.
         The greyed boxes indicate the $\pm 1 \sigma$ band combining the
         statistical and systematic errors of the NC DIS
         expectation.  \\
\vspace*{0.5cm}
{\bf{ Figure 6: }}
                Exclusion limits at $95 \%$ CL on the Yukawa
                coupling $\lambda$ as a function of the LQ mass
                for (a) scalar and (b) vector LQs with
                fermion number $F=2$ described by the BRW model.
                Domains above the curves are excluded.
                The upper curve on each plot indicates the limit
                obtained from the (less suited for $F=2$ LQs)
                $e^+ p$ data. \\
\vspace*{0.5cm}
{\bf{ Figure 7a,b: }}
         Mass dependent exclusion limits at $95 \%$ CL on the branching
         ratio $\beta_e$ of the LQ to decay into $eq$
         for scalar LQs with $F=2$ produced by (a) $e^- d$
         and (b) $e^- u$ fusion. The $D\emptyset$ limit is also
         shown as hatched region. \\
\vspace*{0.5cm}
{\bf{ Figure 8: }}
       Mass spectra for CC DIS-like final states
         for data (symbols) and SM expectation (histograms).
         The greyed boxes indicate the $\pm 1 \sigma$ band combining the
         statistical and systematic errors of the SM
         expectation.  \\
\vspace*{0.5cm}
{\bf{ Figure 9: }}
       Domains ruled out by the combination of the NC and CC analyses,
       for a scalar LQ coupling to $e^- u$ and
       decaying only into $e+q$ and $\nu + q$
       for three example values
       of the Yukawa coupling.
       The regions on the left of the full curves
       are excluded at $95 \%$ CL.
       For $\lambda=0.05$, the part of the
       plane $BR (LQ \rightarrow eq)$-$M_{LQ}$
       ($BR (LQ \rightarrow \nu q)$-$M_{LQ}$)
       on the left of the dashed
       (dotted) curve is excluded by the NC (CC) analysis.
       The branching ratios 
       $BR (LQ \rightarrow eq)$ and $BR (LQ \rightarrow \nu q)$
       are shown on the left and right axes respectively.
       The domain excluded by the $D0$ experiment is also shown
       as the greyed region. \\
       This figure complements / updates Fig. 7b of the contributed
       paper \#954 submitted to the ICHEP'2000 conference. \\

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