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The high accuracy of space data increased the number of the periodicitiesdetermined for pulsating variable stars, but the mode identification is still acritical point in the non-asymptotic regime. We use regularities in frequencyspacings for identifying the pulsation modes of the recently discovered deltaSct star ID 102749568. In addition to analysing CoRoT light curves (15252datapoints spanning 131 days), we obtained and analysed both spectroscopic andextended multi-colour photometric data. We applied standard tools (MUFRAN,Period04, SigSpec, and FAMIAS) for time-series analysis. A satisfactorylight-curve fit was obtaining by means of 52 independent modes and 15combination terms. The frequency spacing revealed distinct peaks around large(25.55-31.43 microHz), intermediate (9.80, 7.66 microHz), and low (2.35microHz) separations. We directly identified 9 modes, and the l and n values ofother three modes were extrapolated. The combined application of spectroscopy,multi-colour photometry, and modelling yielded the precise physical parametersand confirmed the observational mode identification. The large separationconstrained the log g and related quantities. The dominant mode is the radialfirst overtone.

CoRoT 102749568: mode identification in a delta Scuti star based on regular spacings