  We investigate how the Coulomb interaction affects the energy $E$ and width
$\Gamma$ of resonance states in mirror nuclei. We employ a three-cluster
microscopic model to determine position of resonance states in two- and
three-body continua. Two parameters are introduced to quantify effects of the
Coulomb interactions. As the energy and width of the corresponding resonance
states of mirror nuclei are displayed on an $E$-$\Gamma$ plane, these
parameters determine a rotation and a dilatation. With the help of these
parameters we found resonance states with strong, small and medium effects of
the Coulomb interaction. We also found two different scenarios of the motion of
resonance states due to the Coulomb interaction. The first standard (major)
scenario represent resonance states with the larger energy and larger width
than their counterparts have. The second rear scenario includes resonance
states with the larger energy but smaller width.
